唐纳德·特朗普总统在推特上表示，他将“强烈考虑”为弹劾程序作证。如果他坚持到底，这可能是现任美国总统就他自己的弹劾调查做出的第一份证词。
特朗普在针对众议院议长南希·佩洛西的人身侮辱中表示，尽管如此，他还是在周一的帖子中从加州民主党人那里收集到了一个想法。
佩洛西”在周日的《丑化国家》中建议我为虚假的弹劾政治迫害作证。她还说我可以写下来。尽管我没有做错什么，也不喜欢给这个没有正当程序的骗局以可信度，但我喜欢这个想法&威尔，为了让国会再次集中注意力，强烈考虑它！”总统写道。
虽然共和党人呼吁揭露首次披露特朗普与乌克兰通话的匿名举报者，但民主党人却以尖锐的指责回应:让特朗普代表自己作证。
在上周三的听证会上，俄亥俄州众议员吉姆·乔丹，共和党人，反复驳斥了那些有特色的证人，而是呼吁“这一切的始作俑者”，指的是告密者。
根据《新共和报》的报道，佛蒙特州众议员彼得·韦尔奇(Peter Welch)给出了一个令人震惊的反驳:“我很高兴有一个人开创了这一切，”他当时告诉俄亥俄州共和党人。"欢迎特朗普总统进来坐在那里。"
从右上方顺时针方向，美国众议员迈克·奎格利(伊利诺伊州民主党)、众议员肖恩·帕特里克·马洛尼(纽约州民主党)、众议员彼得·韦尔奇(弗吉尼亚州民主党)和众议员埃里克·斯威尔韦尔(弗吉尼亚州民主党)在听证会上聆听，前美国驻乌克兰大使玛丽·约瓦诺维奇(Marie Yovanovitch)于2019年11月15日在DC华盛顿国会山朗沃斯众议院办公楼向众议院情报委员会作证。
尽管现任总统在国会作证，但没有人在自己的弹劾调查中在众议院作证。
比尔·克林顿，1993年至2001年的美国总统，因与白宫实习生莫尼卡·勒温西的性关系而遭到众所周知的弹劾。在谎称自己与莱温斯基卷入了一起单独的性骚扰诉讼后，克林顿在联邦大陪审团面前承认了这种关系，但没有在国会作证。
根据证词，众议院批准了三项弹劾条款，但在随后的参议院审判中，共和党没有达到因“重罪和轻罪”罢免总统所需的三分之二多数。
参议院历史办公室称，第七任美国总统安德鲁·约翰逊于1868年被国会正式弹劾，原因是他否决了旨在保护美国内战中从奴隶制中解放出来的人的权利的立法，并多次试图就相关问题解雇时任美国战争部长埃德温·斯坦顿。
根据参议院历史办公室的陈述，约翰逊在没有作证的情况下在参议院获得无罪释放。
前总统理查德·尼克松没有被正式弹劾。在美国最高法院强迫他公布白宫谈话的全部样本后，“确凿的证据”揭示了他参与水门事件掩盖的程度，降低了他在国会的可信度和政治影响力。
尼克松在众议院就一个特别委员会提交的弹劾条款进行表决之前辞职，而无需在众议院作证。然而，1975年夏天，也就是他辞职的第二年，他确实在水门事件大陪审团面前作证。
特朗普在特别顾问罗伯特·穆勒(Robert S. Mueller)调查俄罗斯干涉选举期间提供了书面证词。他不太可能参加弹劾听证会。
DONALD TRUMP COULD BE THE FIRST PRESIDENT TO TESTIFY DURING OWN IMPEACHMENT INQUIRY
President Donald Trump tweeted that he would "strongly consider" testifying for impeachment proceedings. If he follows through, the testimony could be the first from a sitting U.S. President regarding his own impeachment inquiry.
Side by side with personal insults directed at Speaker of the House Nancy Pelosi, Trump said he nonetheless gleaned an idea from the California Democrat in the Monday thread.
Pelosi "suggested on Sunday's DEFACE THE NATION that I testify about the phony Impeachment Witch Hunt. She also said I could do it in writing. Even though I did nothing wrong, and don't like giving credibility to this No Due Process Hoax, I like the idea & will, in order to get Congress focused again, strongly consider it!" the president wrote.
While Republicans have called for the unmasking of the anonymous whistleblower who first unveiled Trump's phone call with Ukraine, Democrats have responded with a pointed rebuke: let Trump testify on his own behalf.
During last Wednesday's hearing, Ohio Representative Jim Jordan, a Republican, repeatedly dismissed the featured witnesses, calling instead for "the guy who started it all," referring to the whistleblower.
Vermont Representative Peter Welch, a Democrat, gave an electrifying retort, according to reporting by The New Republic: "I'd be glad to have the person who started it all," he told the Ohio Republican at the time. "President Trump is welcome to come in and sit down right there."
Clockwise from upper right, U.S. Rep. Mike Quigley (D-IL), Rep. Sean Patrick Maloney (D-NY), Rep. Peter Welch (D-VT) and Rep. Eric Swallwell (D-CA) listen during a hearing in which former U.S. Ambassador to Ukraine Marie Yovanovitch testifies before the House Intelligence Committee in the Longworth House Office Building on Capitol Hill November 15, 2019 in Washington, DC.
Though sitting presidents have testified before Congress, none have ever testified before the House during their own impeachment inquiry.
Bill Clinton, U.S. President from 1993 to 2001, was famously impeached over his sexual relationship with Monica Lewinksy, a White House intern. After lying about his involvement with Lewinsky in a separate sexual harassment lawsuit, Clinton admitted the relationship before a federal grand jury, but otherwise did not testify before Congress.
In light of the testimony, the House approved three articles of impeachment, but Republicans fell short of the two-thirds majority required to remove the president for "high crimes and misdemeanors" in the Senatorial trial that followed.
The seventh U.S. President Andrew Johnson was formally impeached by Congress in 1868 for vetoing legislation meant to protect the rights of people freed from slavery in the Civil War, as well as repeated attempts to fire then-Secretary of War Edwin Stanton over related matters, according to the Senate Historical Office.
Johnson won acquittal in the Senate without testifying, according to an account by the Senate Historical Office.
Former President Richard Nixon wasn't formally impeached. After the U.S. Supreme Court forced him to release full samples of White House conversations, the "Smoking Gun Tape" revealed the extent of his involvement in the Watergate cover-up, degrading his credibility and political clout in congress.
Nixon resigned before the House could vote on submitted impeachment articles by a special committee without testifying before the House. However, he did testify before the Watergate grand jury in the summer of 1975, the year after his resignation.
Trump offered written testimony during special counsel Robert S. Mueller's investigation into Russian election interference. His participation in the impeachment hearing is considered unlikely.
