Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled McConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (R-Ky.) is urging senators to reject efforts to rein in President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE's ability to take military action against Iran without congressional approval.

The Senate is expected to vote this week on a resolution from Sen. Tim Kaine Timothy (Tim) Michael KaineBiden promises Democratic senators help in battleground states Second GOP senator to quarantine after exposure to coronavirus The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Va.) that would require Trump to end any military hostilities against Tehran within 30 days.

"I will strongly oppose our colleague's effort and urge the Senate to defeat it," McConnell said from the Senate floor.

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McConnell argued that the Kaine resolution is "blunt and clumsy" and would "severely limit the U.S. military's operational flexibility to defend itself against threats posed by Iran."

"The ill-conceived potshots at presidential authorities in the wake of a strike that succeeded using the blunt instrument of a war powers resolution is no substitute at all for answering these broader questions" on foreign policy strategy, McConnell said.

The Senate is expected to start debate on the war powers resolution on Wednesday.

Kaine has the four GOP votes necessary for the resolution to pass initially, with Sens. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (R-Maine), Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Utah), Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) and Todd Young Todd Christopher YoungSenate GOP eyes early exit Why the US should rely more on strategy, not sanctions Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Ind.) expected to support it.

But both Kaine and Sen. John Thune John Randolph ThuneThe Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks Senate GOP eyes early exit MORE (R-S.D.), the chief Senate Republican vote counter, suggested Democrats could pick up additional GOP votes, depending on the final language of the resolution.

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"I think there's a universe of Republicans depending on how it's drafted that might be inclined to be for some version of that," Thune said. "It's not a big universe of members, but it's probably more than the traditional four."

Because Democrats are using the War Powers Act, they are able to force a vote on the resolution limiting Trump despite opposition from McConnell and most Republicans.

The House passed a concurrent resolution earlier this year, but that measure does not go to Trump's desk and traditionally is not legally binding.

The Senate resolution, which still needs to pass the House, is all but guaranteed to spark a veto from Trump. A veto override attempt would fall short because Democrats would need to pick up 20 GOP votes.