Rep. Al Green, D-Texas, has multiple times brought articles to impeach President Trump to the House floor.

Each effort to impeach the president has failed, and he hasn’t garnered support from some top lawmakers in his party, including House Democratic Leader Nancy Pelosi. But Green said he isn’t giving up, contending that Trump is the “quintessential person that impeachment was designed for.”

The House overwhelmingly rejected Green’s impeachment resolutions in December and January.

What does impeachment mean?

Congress has the ability to remove a sitting president from office before his term is finished – an authority granted by the Constitution.

Along with the president and vice president, all civil officers in the U.S. can be removed from office if they are impeached and convicted of bribery, treason or other high crimes and misdemeanors, according to the Constitution.

How does impeachment work?

Article One of the Constitution grants the House of Representatives the sole power of impeachment; the Senate has the sole authority to try all impeachments. If the president is being tried, the Chief Justice should preside over the trial.

The House must vote, requiring a simple majority, to adopt the articles of impeachment. Before a vote, the House Judiciary Committee – or another special committee – may investigate the articles.

The House is able to vote to impeach even if the committee does not recommend doing so.

Should that vote be reached, then the House will appoint members – called managers – to act as “prosecutors” as the proceedings then go to trial in the Senate. The president is able to have defense attorneys.

The Senate would need a two-thirds majority in order to find the president guilty. Should that happen, the president would be removed from office and the vice president would take the president's place.

Have other presidents been impeached?

Only two U.S. presidents have been impeached – and neither were removed from office.

Andrew Johnson was impeached in 1868 and Bill Clinton in 1998.

While the proceeding began against former President Richard Nixon, he was not actually impeached. Nixon was the only president to resign from office.

Fox News' Brooke Singman and The Associated Press contributed to this report.

Meghan McCain on Sunday said the White House aide who allegedly mocked her father's brain cancer has yet to apologize publically.

Kelly Sadler, a White House communications official, was reportedly overheard talking about Sen. John McCain's opposition to President Donald Trump's pick to lead the CIA. She reportedly said, "It doesn't matter, he's dying anyway."

McCain was diagnosed with a deadly from a brain cancer. His daughter was on ABC News on Sunday and said Sadler apologized for the remark.

"When I had a conversation with Kelly, I asked her to publicly apologize and she said she would," she told ABC News. "I have not spoken to her since and I assume that it will never come."

The co-host of ABC’s “The View” suggested Friday that the aide should be fired from her position over the comment. "I don't understand what kind of environment you're working in when that would be acceptable and then you could come to work the next day and still have a job," she said on the show. "And that's all I have to say about it."

The White House communications team is facing intense scrutiny after the comments were leaked to the media.

Press secretary Sarah Huckabee Sanders didn't address the topic during a briefing on Friday.

Sen. Lindsey Graham, R-SC., and other lawmakers have criticized the remark, saying it was a "pretty disgusting thing to say" and noted "if it was a joke, it was a terrible joke."

Sanders slammed her personnel in a meeting on Friday, according to Axios, saying "I am sure this conversation is going to leak, too. And that’s just disgusting." 

The Trump administration's national security team is considering eliminating the top White House cybersecurity job -- a decision that would likely rankle Democrats, many of whom fear possible foreign interference in the upcoming midterm elections.

Specifically, John Bolton, who recently became President Donald Trump's national security adviser, is advocating for the elimination of the role of special assistant to the president and cybersecurity coordinator, Politico reported. The position is currently occupied by Rob Joyce.

The possible changes come as a surprise as Bolton has been considered a supporter of a more vigorous cybersecurity strategy that targets enemies of the U.S. Earlier this year, he urged the White House to do more to counter the Russian threat, saying "it is not enough, however, to file criminal charges against Russian citizens, nor are economic sanctions anywhere near sufficient to prove our displeasure."

He went on to suggest a "retaliatory cyber campaign against Russia" that "should be decidedly disproportionate" in order to teach Russia that the "costs to them from future cyberattacks against the United States will be so high that they will simply consign all their cyberwarfare plans to their computer memories to gather electronic dust."

Experts and former National Security Council officials say the elimination of the role would indicate the U.S. doesn't consider cybersecurity a top priority and would undermine the progress it made since the job was created at the beginning of the Obama administration.

Megan Stifel, a former NSC director for international cyber policy, told Politico that abolishing the position would signal to other countries "that the U.S. is taking the gas pedal off of cybersecurity as a key national security issue.”

“With no one at the helm at the White House to manage this process, I worry about which countries will step in,” she added.

Michael Daniel, the Obama administration’s cyber coordinator from 2012 to 2017, seconded, saying: “Given the complexities of the issues that we face in cyberspace … you’re going to have to have somebody that’s focused on dealing with those issues at the White House level."

Changes to the NSC are long sought by Bolton, who previously told the council's employees that a staff overhaul is immminent, including an influx of new people and a reorganization.

A source familiar with the situation told Fox News in April that Bolton sent a memo to staffers saying some changes could include combining high-level director positions.

Mira Ricardel, Bolton's deputy, is reportedly in favor of the move to abolish Joyce's role, with one former U.S. official telling Politico that Ricardel may pick up those duties.

The White House did not deny the role could be abolished, according to Politico.

FRANKEN, DEMS RAISE ALARM ABOUT CYBER-MEDDLING IN MIDTERMS

The push to abolish the cybersecurity post also came as Democrats are increasingly warning about foreign interference during the elections.

Former U.S. Sen. Al Franken spoke about cybersecurity earlier this month, at an event in Portugal four months after he resigned amid sexual misconduct allegations. He urged Congress to secure Americans’ privacy and democracy.'

“They’ll be back. They never left,” Franken said about Russia’s disinformation efforts in the country.

Two congressional Democrats, Reps. Ted Lieu, of California, and Ruben Gallego, of Arizona, also asked the White House to provide what security precautions Trump is taking to avoid being hacked by foreign hackers over his personal phone use.

Fox News' Samuel Chamberlain and Serafin Gómez contributed to this report.