"We now have the 51 votes that we need", Sen.
The first version of Kaine's resolution was introduced in the wake of the US airstrike that killed Iranian general and terrorist Qassem Soleimani.
"And there are a number of other Republicans who are looking at it as well", he said. "I'm going to keep working to get more until we have this vote soon".
Kaine told reporters that the second version of the resolution - which would mandate the USA withdraw troops from hostilities against Iran - has the support of four Republicans in addition to all of his Democratic colleagues, which would give it a simple majority to pass.
Two additional Senate Republicans -Susan Collins of ME and Todd Young of IN - came out IN support of the revised measure on Tuesday, bringing the total supporting the measure to 51 votes, enough to pass.
The House passed its own war powers resolution last week.
Trump would nearly certainly veto a measure that clips his powers to take military action, and there likely are not sufficient votes in Congress to overcome a veto.
"Over the past decade, Congress has too often abdicated its constitutional responsibilities on authorizing the sustained use of military force", Collins said in a statement. "Susan Collins will join three other members of the GOP who had previously announced their support for the measure to invoke Congress' war powers". "Although the President as Commander in Chief has the power to lead and defend our armed forces and to respond to imminent attacks, no President has the authority to commit our military to a war". That second bipartisan resolution, filed last week, was modified from an earlier Democratic version introduced in the hours after the January 3 drone strike killing of Iranian Maj.
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Iran's Revolutionary Guard Gen. Qassem Soleimani attends a meeting with Supreme Leader Ayatollah Ali Khamenei and Revolutionary Guard commanders in Tehran, Iran, on September 18, 2016.
"I will be supporting, shall we call it, Kaine 2.0., the newer Kaine language, should I have an opportunity to vote on it", Young told reporters in Washington.
Once the House sends over impeachment articles to the Senate, as is expected Wednesday, all other legislative business would be placed on hold while senators participate in the impeachment trial of the president.
Senate Minority Leader Chuck Schumer (D-N.Y.) said that "so many Americans are worried" about what Trump might do in Iran.
Meanwhile, as members continue to raise questions about recent military actions with Iran, several State Department officials on Wednesday morning are slated to meet with members of the Senate Foreign Relations Committee.
As a concurrent resolution, that measure would not have needed Trump's signature.
"I don't believe the blunt instrument of the war powers resolution is an acceptable substitute for the studied oversight the Senate can exercise through hearings, resolutions, and more tailored legislation", McConnell said on the Senate floor on Monday.