GOP lawmakers got into several furious exchanges with Ronald Rowe Jr. while grilling the new Secret Service boss in a tense hearing about the agency’s failure to protect former President Donald Trump, 78, from the recent attempt on his life. Rowe, who became Acting Director of the Secret Service after his predecessor Kimberly Cheatle resigned in the wake of another contentious hearing, faced off against Republican Senators including Ted Cruz and Josh Hawley, RadarOnline.com can reveal. Hawley, 44, shouted at Rowe as he demanded to know why no agents have been fired over the massive security br…