Lindsey Graham: Trump caving on border security 'probably the end of his presidency'

Sen. Lindsey Graham, R-S.C., told Fox News' "Hannity" Wednesday night that if President Trump backs away from his demand for $5.7 billion to fund a wall along the U.S.-Mexico border, it would mark "the end of 2019 in terms of him being an effective president" and "probably the end of his presidency."