Democratic vice presidential nominee Tim Walz is facing heat over his portrayal of his military service, with several dozen Republican veterans in Congress denouncing the Minnesota governor and demanding he “come clean.”

In a letter sent to Walz on Wednesday, a group of 50 GOP lawmakers in Congress condemned him for his “egregious misrepresentations” of his military record and for “lying about the nature of your service.” The letter, sent on Trump-Vance letterhead, was signed by four senators and 46 representatives, ranging from those who are staunch allies of former President Donald Trump to centrist GOP incumbents in swing districts.