Sen. Josh Hawley (R-Mo.) on Saturday night fired back at criticism from Sen. Pat Toomey (R-Penn.), challenging him to a debate on the Senate floor over irregularities in the presidential election. Hawley, who is part of an effort to oppose the certification of the Electoral College votes, sent an email to the Senate GOP Conference Saturday night, saying that Toomey was “making unfounded claims about the intentions of our fellow Senators.” In the email, Hawley said that “very serious irregularities” have occurred on a “very large scale” during last year’s election, including in Toomey’s home state of Pennsylvania, where some election procedures were altered to enable mass scale mail-in voting. “Instead of debating the issue of election integrity by press release, conference call or e-mail, perhaps we could have a debate on the Senate floor for all of the American people to judge,” he wrote. Toomey is one of the Senate …