A key GOP senator in President Donald Trump’s impeachment trial said it should proceed the same as Bill Clinton’s in 1999, but she’d like to hear more information after the case has been presented and would consider calling more witnesses.

U.S. Sen. Susan Collins of Maine protested Thursday afternoon about what she said has been “a lot of mischaracterization and misunderstanding about my position on the process the Senate should follow for the impeachment trial.”

Opening arguments will begin at 1 p.m. Tuesday after the Senate formally received House Democrat-authored impeachment articles Thursday. Chief Justice John Roberts swore in the senators who will decide if Trump is guilty of impeachable crimes and should be removed from office.

As a GOP moderate who is facing reelection, Collins is widely seen as a possible swing vote who could side with Democrats who want additional witnesses called in during Trump’s impeachment trial.

House Speaker Nancy Pelosi has named seven impeachment managers for President Donald Trump's upcoming Senate trial: U.S. Rep. Adam Schiff of California, chair of the House Intelligence Committee, and lead manager U.S. Rep. Jerrold Nadler of New York, chair of the House Judiciary Committee U.S. Rep. Zoe Lofgren of California U.S. Rep. Hakeem Jeffries of New York U.S. Rep. Val Demings of Florida U.S. Rep. Jason Crow of Colorado U.S. Rep. Sylvia Garcia of Texas Senate Majority Leader Mitch McConnell expects

Democrats are claiming new evidence coming to light almost daily necessitates the need to call more witnesses than they did during Trump’s impeachment hearings in the House.

“From the outset, I have said that we should follow the model that we used with the Clinton impeachment trial,” said Collins, who also served as a senator during Clinton’s trial. “At the conclusion of that phase of the 1999 trial, the Senate voted on a motion to subpoena witnesses and admit additional materials after the case had been heard and the questions had been posed.

“I voted in favor of that motion subpoenaing witnesses.”

President Bill Clinton was impeached on perjury and obstruction of Congress charges on Dec. 19, 1998. He was acquitted by the Senate on Feb. 12, 1999. Fourteen senators from that trial still remain in office. Here's how they voted. Susan Collins, R-Maine. Not guilty on both counts Michael D. Crapo, R-Idaho. Guilty on both counts Richard Durbin, D-Illinois. Not guilty on both counts Mike Enzi, R-Wyoming. Guilty on both counts Dianne Feinstein, D-California. Not guilty on both counts Charles Grassley, R-Iow

Collins said in Trump’s trial, like Clinton’s, “both sides should have the opportunity to state their case and the senators should have the opportunity to pose questions.

“Then, the Senate should have an up-or-down-vote on whether to subpoena witnesses and documents.”

Collins believes “having additional information would be helpful. It is likely that I would support a motion to call witnesses at that point in the trial just as I did in 1999.”

However, Collins will not support any attempts to subpoena document or witnesses prior to hearing the case.

U.S. House Democrats have drafted two articles of impeachment against President Donald Trump. House leaders are charging the president with abuse of power and obstruction of Congress. They announced the articles of impeachment on Dec. 10, 2019. A full House impeachment vote could come before Christmas. If passed, the president would face a Senate trial in 2020, a presidential election year.

Also, “I have not made a decision on any particular witnesses,” Collins said. “When we reach the appropriate point in the trial, I would like to hear from both sides about which witnesses, if any, they would like to call.”

The House approved transmitting the articles by a party-line vote of 228-193. The approval of Pelosi’s seven impeachment managers also appropriated taxpayer funds that will be used in Trump’s trial.

John Roberts serves as the 17th Chief Justice of the United States. He was born in Buffalo, N.Y., and grew up in the Midwest. He completed his undergraduate degree at Harvard and then attended Harvard Law School, graduating with a law degree in 1979. Roberts worked as a clerk during his early legal career, then went into private practice, arguing 39 cases before the Supreme Court. Roberts was appointed to the U.S. Court of Appeals in 2003. President George W. Bush nominated Roberts to the Supreme Court af

The impeachment managers hand-delivered the impeachment articles to the Senate on Wednesday evening.

The House voted Dec. 18 to impeach Trump on charges of abuse of power and obstruction of Congress stemming from his conduct toward Ukraine.

Impeachment was established in the U.S. Constitution as a way to accuse a president of a crime and then hold a trial to determine if guilty. The first step requires a U.S. House member to introduce an impeachment resolution. The House speaker directs the judiciary committee to hold a hearing to decide whether to put the full measure to a vote by the full chamber. A majority of the committee must approve the resolution. If approved, it moves to a full vote on the House floor. If a majority of the House vot

Trump is the third president to be impeached in U.S. history. The others are Clinton and, in 1868, Andrew Johnson. President Richard Nixon resigned before the House could impeach him.