WASHINGTON — U.S. Rep. Ken Buck argued Wednesday that nearly any president — Abraham Lincoln, John F. Kennedy, Franklin Delano Roosevelt, Barack Obama — could have been impeached under “amorphous” standards being used by Democrats in their impeachment inquiry.

The Windsor Republican was allotted five minutes to ask questions during the House Judiciary Committee’s first hearing in its impeachment inquiry into President Donald Trump. He used that time to ask a law professor whether past presidents could have been impeached for their wrongdoing.

“Can you name a single president in the history of the United States — save President (William Henry) Harrison, who died 32 days after his inauguration — that would have not met the standard of impeachment for our friends here?” Buck asked the professor, Jonathan Turley.

“Your friends,” Buck said, referring to other law professors on a panel, whom Turley disagreed with, “have decided that the bar is so low that when we have a Democrat president, and a Republican House and a Republican Senate, we are going to be going through this whole scenario again, in a way that really puts the country at risk.”

Turley, a George Washington University professor invited by Republicans, agreed that under a standard used by some Democrats and legal scholars, nearly any past president could have been impeached.

Rep. Ken Buck, R-Colo., talks during ...
Andrew Harnik, The Associated Press
Rep. Ken Buck, R-Colo., talks during a hearing before the House Judiciary Committee on the constitutional grounds for the impeachment of President Donald Trump, on Capitol Hill in Washington, Wednesday, Dec. 4, 2019.

Buck, a former state and federal prosecutor and current chair of the Colorado Republican Party, has been firmly committed to Trump’s defense. His Twitter account was active during Wednesday’s hearing, accusing a witness of bias, mocking the committee’s Democratic chairman and accusing that chairman of not being transparent.

“This is an embarrassment to the Judiciary Committee,” he wrote after witnesses testified.

The congressman’s remarks came on the opening day of the House Judiciary Committee’s impeachment hearings, an eight-hour day that centered on the constitutional parameters for impeachment. Three professors who are legal experts on impeachment testified that the president has committed impeachable offenses, including abuse of power, bribery and obstruction of justice. One professor — Turley — testified that he has not.

“Based on the evidentiary record, what has happened in the case before you is something that I do not think we have ever seen before: a president who has doubled down on violating his oath to faithfully execute the laws and to protect and defend the Constitution,” said Stanford University professor Pamela S. Karlan.

Turley argued throughout the day that there is no evidence for impeaching Trump.

“If you’re going to accuse a president of bribery, you need to make it stick, because you’re trying to remove a duly elected president,” he told the House Judiciary Committee.

Buck’s remarks came one day after Democrats on the House Intelligence Committee released a lengthy report that lays out the case Trump abused the powers of the presidency by withholding military aid and a White House meeting as he pressured Ukraine to investigate the family of Joe Biden, a political rival. The report’s Democratic authors say it provides “overwhelming evidence of (Trump’s) misconduct.”

Buck is one of two Coloradans on the House Judiciary Committee, along with Rep. Joe Neguse, a liberal Lafayette Democrat and outspoken supporter of the impeachment inquiry.

Constitutional law experts, from left, Harvard ...
Jacquelyn Martin, The Associated Press
Constitutional law experts, from left, Harvard Law School professor Noah Feldman, Stanford Law School professor Pamela Karlan, University of North Carolina Law School professor Michael Gerhardt and George Washington University Law School professor Jonathan Turley, are sworn in to testify during a hearing before the House Judiciary Committee on the constitutional grounds for the impeachment of President Donald Trump, Wednesday, Dec. 4, 2019, on Capitol Hill in Washington.

“President Trump has tried to interfere in both the Ukraine investigation and special counsel (Robert) Mueller’s investigation in order to try to cover up his own conduct,” Neguse said during his five minutes, focusing on allegations that Trump has intimidated witnesses.

“The president actively discouraged witnesses from cooperating, intimidated witnesses who came forward, and praised those who refused to cooperate,” Neguse added, showing the room quotes from Trump in which he called an unidentified whistle-blower “a disgrace to our country.”

Republicans forced several unsuccessful votes — to subpoena a whistle-blower; to force Rep. Adam Schiff, D-Calif., to testify before the Judiciary Committee; to delay the impeachment hearings. On every occasion, Buck voted with Republicans and Neguse voted with Democrats.

Rep. Ken Buck, R-Colo., questions constitutional ...
Jacquelyn Martin, The Associated Press
Rep. Ken Buck, R-Colo., questions constitutional law experts during a hearing before the House Judiciary Committee on the constitutional grounds for the impeachment of President Donald Trump, Wednesday, Dec. 4, 2019, on Capitol Hill in Washington.

Wednesday’s hearing revealed that the two sides — the two major political parties — are not only operating with different opinions about the president and his behavior, but different facts. As Rep. Doug Collins, a Georgia Republican, said in his opening statement, “There are no set facts here.”

Both sides cited the the Constitution and American history to make their arguments. Both sides dredged up two-decade-old quotes from members of Congress during the President Bill Clinton impeachment, to allege hypocrisy by their opponents.

“Our Founding Fathers warned us about hyper-partisan impeachment hearings,” tweeted Rep. Doug Lamborn, a Colorado Springs Republican and spectator at Wednesday’s hearing. “From day one, House Democrats aided by the liberal media have set out to reverse the results of the 2016 election and remove (Trump) from office.”

Rep. Diana DeGette, a Denver Democrat, said Wednesday’s hearing shows that no one is above the law.

“Three of the nation’s top constitutional law experts just told the House Judiciary Committee that, in their opinion, President Trump committed at least three impeachable offenses: bribery, abuse of power and obstruction of justice,” DeGette noted in a statement.