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The resolutions blocking Trump's arms sales are anticipated to be able to pass the Senate, where they only need a simple majority. At least four Republicans are expected to vote with all 47 Democrats to block the arms deal.

House Democrats have also pledged to block the sales, setting the stage for a massive veto showdown with Trump. Neither chamber is expected to have the votes to override the vetoes.

"I think the votes going to be significant — well over 50 but possibly over 60 and even with a potential of getting a veto-proof," Paul told reporters.

The unprecedented move to block the sales reflects growing frustration on Capitol Hill about the U.S.-Saudi relationship and would come after two votes fell short in recent years to block arms deals with Saudi Arabia. One, in 2016, garnered support from only 27 senators. The other, in June 2017, had the backing of 47 senators.

Since then, U.S.-Saudi relations have soured further amid growing concerns about Saudi Arabia’s involvement in the years-long Yemen civil war and the death of Washington Post contributor Jamal Khashoggi in 2018.

Trump sparked bipartisan backlash when he invoked an emergency provision under the Arms Export Control Act to push through the sales without a congressional review period.