Sen. Ted Cruz is accusing President Joe Biden of mixing taxpayer dollars in his campaign maneuvers. “I write to refer this to you for investigation as a possible violation of the Hatch Act, federal law that broadly prohibits using taxpayer dollars for campaign activity,” reads a letter Cruz submitted on Thursday to Hampton Dellinger, head of the Office of Special Counsel, according to POLITICO. “Congress, not President Biden, wrote [the infrastructure law], and it did not do so to aid the President’s reelection campaign.” “These displays are nothing more than campaign yard signs courtesy of th…