By Andrew Chung WASHINGTON (Reuters) -Former President Donald Trump on Monday asked the U.S. Supreme Court to intervene in his fight to prevent a U.S. House of Representatives committee from gaining access to his tax returns for reasons he claims are politically motivated. Trump filed an emergency request to put on hold a lower court ruling against the Republican former president that upheld the Democratic-led House Ways and Means Committee’s request for the tax materials as a justified part of its legislative work while his attorneys prepare an appeal. “If allowed to stand, it will undermine …