A group of Republican senators led by veteran lawmaker Ted Cruz said Saturday they will challenge Joe Biden's election win -- the latest last-ditch move to support Donald Trump's efforts to undermine the vote. 

The initiative, which appears certain to fail, flies in the face of rulings in dozens of courts and the findings by officials in several key states that there were no widespread voting problems.

The Republicans' statement, signed by Cruz and six other current senators along with four senators-elect, asserts that "allegations of fraud and irregularities in the 2020 election exceed any in our lifetimes."

The group said that when Congress convenes in a joint session on Wednesday -- for what normally would be a pro-forma certification of Biden's victory -- they will demand the creation of a special commission to conduct an "emergency 10-day audit" of the election results.

The statement says individual states could then convene special legislative sessions and potentially revise their vote totals.

"An attempt to steal a landslide win. Can't let it happen!" Trump tweeted Saturday.

A Republican member of the House of Representatives, Louie Gohmert, has also announced his plan to oppose certification, and more than 100 House Republicans reportedly will back his challenge.

As with Trump's other attempts to reverse his election defeat, the latest political maneuvering appears doomed. Democrats control the House, and many Republicans are expected to vote Wednesday for certification.

Meanwhile, the new US Congress faces many uncertainties as it takes office later Sunday, with Senate control undecided, a narrower Democratic majority in the House of Representatives and Republicans planning an immediate fight over the normally routine election certification.

Democrats lost 11 House of Representatives seats in the November elections, leaving them with a narrow 222-212 majority that gives Speaker Nancy Pelosi little room to maneuver in her first task of being re-elected as the chamber's leader.