3/3 © Reuters. FILE PHOTO: Michael Cohen, the former personal attorney of U.S. President Donald Trump, is sworn in to testify before a House Committee on Oversight and Reform hearing on Capitol Hill in Washington, U.S., February 27, 2019. REUTERS/Jonathan Ernst/File Pho 2/3 By Luc Cohen and Karen Freifeld NEW YORK (Reuters) - A former lawyer for Donald Trump who once said he would do anything to protect the former U.S. president is now poised to serve as a key witness in the criminal trial of his longtime boss. Michael Cohen, who became a top executive at Trump's real estate...