WASHINGTON — Secretary of State Rex Tillerson on Sunday minimized tensions with his boss, President Donald Trump, and brushed aside comments from an influential lawmaker, who compared Trump’s undermining of his top diplomat to a public castration.“I am fully committed to his objectives. I agree with his objectives. I agree with what he is trying to do,” Tillerson said of Trump on CNN’s ‘State of the Union’ program.Tillerson’s tenure as secretary of state has been dogged by rumors about rifts with Trump over policy.