NY, joins Morning Joe to discuss New York City's mayoral primary and if it provides insight for Democrats nationwide. Leader Jeffries also discusses the U.S. strikes on Iranian nuclear sites and the postponing of bipartisan congressional briefings on Iran.

House Minority Leader Hakeem Jeffries (D-N.Y.) on Monday flashed some fury with the Trump administration for sidelining Congress on its strikes on Iranian nuclear facilities. Why it matters: Jeffries notably did not weigh in on a measure to limit Trump's ability to carry out such attacks unilaterally and signaled that evidence the administration presents to Congress will be key.