Every so often in American history Congress is called upon to play a defining role on matters of war and peace, pursuant to its constitutional duties and the national security needs of the time. Now is such a moment.

Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.), chairman of the Senate Foreign Relations Committee, and Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.), chairman of the Senate Armed Services Committee, are two leaders who have risen to the occasion at a dangerous moment in history.

Corker’s soft spoken but Churchillian warnings about the national security dangers that concern him about the presidency of Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE should be thoughtfully considered. Many leaders of allied nations are deeply worried about the capability of our commander in chief. The chairman of the Foreign Relations Committee worries he could trigger World War III. The secretary of State reportedly referred to him as a moron. Officials at high levels in his administration reportedly collaborate to mitigate the dangers caused by the president’s uninformed and impulsive instincts and actions.

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It is high time for Congress, and particularly the Senate, to rise to the occasion on matters of war and peace as discussed below.

During the Vietnam War Sen. William Fulbright, a Democrat from Arkansas and chairman of the Senate Foreign Relations Committee, convened 11 days of hearings in 1971 that brought together leading voices on national security to consider proposals to end that war.

The Fulbright hearings made a seminal contribution to American foreign policy. It would be a profound service to the nation if Chairman Corker and Chairman McCain would convene the Senate Foreign Relations and Armed Services committees for joint hearings about critical matters of war and peace that create significant dangers to the nation and those who serve her.

The purpose of these hearings would be to seek honest and unvarnished advice, from respected national security voices from inside and outside the Trump administration, about the dangers in the world and the wisest American response to them.

Regarding Russia, these hearings would not address any investigation now in progress but would discuss and dramatize the continuing war against American democracy from a Russian dictator and the successors to the KGB under his command, which is so comprehensive and aggressive it constitutes a cyberwar and espionage Pearl Harbor attack against us.

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It is a crime against common sense, and a danger to our security, that our commander in chief refuses to acknowledge that this attack against us has begun and falsely claims those who investigate the crimes or protect us from their danger are spreading fake news or acting like Nazi Germany. The hearings proposed here would fully and accurately describe the threat and intelligently discuss the proper American response.

Active duty and retired commanders of the military services would testify at these hearings to offer clear and sound military advice on matters including threats from Russia, cooperation with our democratic allies, dangers on the Korean Peninsula, nuclear weapons strategy and the nuclear agreement with Iran.

Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE and Secretary of Defense James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE would testify, alongside former secretaries of State and Defense who served presidents of both parties and leading experts in foreign policy and national defense. White House chief of staff John Kelly John Francis KellyMORE and national security adviser H.R. McMaster could be cordially invited to share their well-informed views if they would welcome the opportunity to offer them.

It would be invaluable for the nation to witness lengthy, in-depth, nonpartisan and high visibility hearings during which internationally respected Americans would discuss at length the threats facing the nation and how we should, and should not, address these threats.

It does no service to our security when the presidency is reduced to insulting tirades attacking first team players who shape the policies that protect our nation. It would be a historic service to the nation — and the president — for Congress to begin a deep and informed discussion of war and peace at this very dangerous moment.

Brent Budowsky was an aide to former Sen. Lloyd Bentsen (D-Texas) and former Rep. Bill Alexander (D-Ark.), who was chief deputy majority whip of the U.S. House of Representatives. He holds an LLM in international financial law from the London School of Economics.