Trump Continues to Challenge Election Results as Legal Options Dwindle

WASHINGTON—A defiant President Trump continued efforts to contest the outcome of the election, as his legal options narrowed and a number of Republicans expressed frustration with his refusal to acknowledge defeat.

Despite pressure to concede, Mr. Trump’s team over the weekend sought fresh avenues to reverse his loss to President-elect Joe Biden. They pledged to appeal a federal ruling in Pennsylvania that dismissed one of their lawsuits and filed a recount petition in Georgia after the election results were certified with…