By Andrew Chung WASHINGTON (Reuters) -U.S. Chief Justice John Roberts on Tuesday temporarily blocked a U.S. House of Representatives committee from gaining access to former President Donald Trump’s tax returns, effectively pausing the fight over a request from lawmakers that he claims is politically motivated. The order from the chief justice maintains the status quo while the Supreme Court assesses Trump’s emergency request, filed on Monday, to block a lower court ruling that upheld the House panel’s request for the tax materials as a justified part of its legislative work, while his attorney…