Sen. Richard Blumenthal said Thursday there are “gaps” in Donald Trump Jr.’s closed-door testimony before the Senate Judiciary Committee, and that he expects President Donald Trump's son to return for a public hearing before the panel.Trump Jr. testified behind closed doors on Thursday for more than five hours about a meeting he brokered last year at Trump Tower with a Russian lawyer with reported ties to the Kremlin.President Donald Trump’s eldest son told the judiciary panel that he accepted the meeting — which was billed as a chance to get dirt on Hillary Clinton — because he wanted to learn about Clinton’s “fitness” for the presidency, according to his opening statement, which was obtained by The New York Times.