By Patricia Zengerle and Richard Cowan WASHINGTON (Reuters) -The House of Representatives committee investigating the Jan. 6, 2021, attack on U.S. Capitol said on Tuesday it had postponed a hearing scheduled with officials from ex-President Donald Trump’s Justice Department but would go ahead with one set for Thursday focused on ex-Vice President Mike Pence. The committee said its hearing Thursday would present testimony illustrating how Trump put pressure to refuse to count votes on his vice president, Mike Pence, on and before Jan. 6. “As a federal judge has indicated, this likely violated t…