By Luc Cohen and Jody Godoy NEW YORK (Reuters) -Tom Barrack, a onetime fundraiser for former U.S. President Donald Trump, took the witness stand in his own defense on Monday in his trial on charges of being an illegal foreign agent for the United Arab Emirates. Federal prosecutors in Brooklyn said Barrack used his influence with Trump’s election campaign and administration to push the UAE’s interests in 2016 and 2017 without notifying the U.S. attorney general, as required by law. They say Emirati sovereign wealth funds invested $374 million in Barrack’s private equity firm Colony Capital, now…