President Donald Trump ordered a freeze starting Tuesday on potentially trillions of dollars in federal funding to Americans, impacting everything from education grants to small businesses loans -- and sparking accusations that he is violating the constitution.The order was issued by the White House budget office in a memo a week into Trump's second term.It was not clear in the memo, signed by acting director of the Office of Management and Budget (OMB) Matthew Vaeth, how such a pause on disbursements of funding will work or for how long.The extraordinary measure follows a similar announcement that US foreign aid is...