Republicans would like to be heard in court, at which time they would present their evidence.
But they will not be heard by the judiciary, because no one in the world has standing.
There have been four cases were they actually presented evidence. One of the most interesting one was decided by a federal district court judge who is a conservative. Here’s what he said;
“One might expect that when seeking such a startling outcome, a plaintiff would come formidably armed with compelling legal arguments and factual proof of rampant corruption,” Brann wrote, so much that the court would have no option but to stop the certification even though it would impact so many people. “That has not happened.”
https://www.wfla.com/news/politics/judge-throws-out-trump-lawsuit-to-block-votes-in-pennsylvania/