Patrick Semansky / AP

Republican Sen. Susan Collins says she's getting death threats after her vote to acquit President Donald Trump at his impeachment trial, saying three of them were deemed "credible" and are being investigated.

Collins made the disclosure Friday while addressing the Maine Chiefs of Police Association winter conference. She said she's always appreciated law enforcement officers but that she now has a "personal appreciation" for what they do to keep people safe.

We discuss the history of impeachments and the Senate impeachment trial, its outcome, the votes of Sens. Angus King and Susan Collins, and we get listener reactions to the impeachment process.

J. Scott Applewhite / AP

The Impeachment drama has continued right up to the actual Senate votes to acquit President Donald Trump.

Maine Public Radio Senior Political Reporter Mal Leary spoke Wednesday afternoon before the vote with Republican U.S. Sen. Susan Collins about her decision to acquit the President on both charges and about what she has been hearing from constituents. 

J. Scott Applewhite / Associated Press

Republican U.S. Sen. Susan Collins announced Tuesday that she will vote to acquit President Donald Trump of impeachment charges, a decision that could affect her reelection bid in a state frayed over the president’s rhetoric and conduct.

J Scott Applewhite / AP

U.S. Republican Sen. Susan Collins says she is disappointed that the Senate has voted against calling its own witnesses in President Trump’s impeachment trial.

Steve Helber / AP

Republican U.S. Sen. Susan Collins and independent Sen. Angus King joined Democrats Friday in a failed attempt to gather additional witnesses and documents in the impeachment trial of President Donald Trump.

U.S. Sen. Angus King wants to hear from constituents ahead of Wednesday's expected final impeachment vote.

Steve Helber / Associated Press

Maine Republican U.S. Sen. Susan Collins says she will vote in favor of calling witnesses in the impeachment trial of President Donald Trump.

Willis Ryder Arnold / Maine Public

Activists in Portland Wednesday called on U.S. Republican Sen. Susan Collins to support calling witnesses in President Donald Trump's Senate impeachment trial.

J. Scott Applewhite / Associated Press

Republican U.S. Sen. Susan Collins says new revelations in a book draft by former national security advisor John Bolton strengthen the case for witnesses in President Trump's ongoing impeachment trial.

Jose Luis Magana / AP Photo

U.S. Sen. Angus King, I-Maine, says he believes the Senate will fully debate whether witness testimony should be required in the impeachment trial of President Donald Trump, but he says whether enough Republicans will vote to call in witnesses, such as former National Security Advisor John Bolton or acting Chief of Staff Mick Mulvaney, is another matter.

Evan Vucci / Associated Press

After pushback from Democrats on the proposed rules for President Donald Trump’s impeachment trial, Senate Majority Leader Mitch McConnell did an about face Tuesday afternoon. He’s now offering three days, rather than two, for opening arguments from each side, but critics say it will still keep most Americans in the dark about the president’s actions.

The White House released its formal response to the summons sent by the Senate last week, a procedural part of the impeachment process ahead of the trial that begins on Tuesday.

"The articles of impeachment submitted by House Democrats are a dangerous attack on the right of the American people to freely choose their president," the White House's response says. "This is a brazen and unlawful attempt to overturn the results of the 2016 election and interfere with the 2020 election."

Updated Sunday at 11:34 a.m. ET

The White House's legal team has called the House impeachment process "highly partisan and reckless" in a forceful response to the summons issued last week by Majority Leader Mitch McConnell ahead of President Trump's Senate impeachment trial, which begins Tuesday.

Updated at 6:30 p.m. ET

The House of Representatives has delivered articles of impeachment against President Trump to the Senate, which is expected to begin a trial next week.

Earlier in the day, House Speaker Nancy Pelosi named seven Democratic members of Congress as the managers who will argue the case for impeachment.

Those managers brought the articles to the Senate on Wednesday evening.