Donald Trump barrels into Washington Monday for the first time as the Republican presidential front-runner, arriving like a cross between P.T. Barnum and a Roman general whose crossing of the Rubicon makes senators extremely nervous.

Trump is in town to address the American Israel Public Affairs Committee conference on Monday. Some Jewish leaders are boycotting the speech even as others eagerly await any indication Trump has ideas about Israel that go beyond experience as the grand marshal of a Israeli Day Parade, an unsubstantiated refrain that “no one has done more for Israel” than him, and a controversial commitment to neutrality between Israel and Palestinians.