By Steve Holland WASHINGTON (Reuters) – A top White House adviser said on Friday Republicans might try to impeach President Barack Obama over his go-it-alone immigration strategy, as Obama prepared to talk about the U.S. border crisis with Central American presidents. Dan Pfeiffer, one of Obama’s longest-serving advisers, told reporters that the executive actions Obama will approve at the end of the summer aimed at tackling illegal immigration will likely generate ire from Republicans who have blocked comprehensive immigration legislation. Republicans in the House of Representatives are expected next week to authorize a lawsuit against Obama on charges he has overstepped his constitutional authority by signing a series of executive orders this year on issues such as raising the minimum wage for federal contract workers. Pfeiffer, speaking at a reporters’ breakfast organized by the Christian Science Monitor, said he could easily see Republicans moving to impeachment proceedings to try to remove Obama from power in retaliation for the immigration orders he is expected to unveil by the end of the summer. “The president acting on immigration reform will certainly up the likelihood that they would contemplate impeachment,” he said.