By Ted Hesson WASHINGTON (Reuters) -The White House will step up its engagement with U.S. lawmakers trying to strike a bipartisan deal that would provide military aid for Ukraine and Israel while tightening U.S. border security, a Democratic senator said on Sunday. Republicans have insisted that additional funding for Ukraine must be paired with major U.S. border security changes but a bipartisan group of senators trying to broker a compromise have made little progress with less than a week before the U.S. Congress leaves for a Christmas break. “The White House is going to get more engaged thi…