Conservatives are holding one of their largest annual gatherings at a perilous political moment for President Donald Trump and with open division on the right over the war he launched in Iran. While the president maintains broad support among conservatives, the war in Iran is more than a wrinkle for activists drawn to his "America First" campaign pledge against getting involved in foreign conflicts. A new AP-NORC poll shows about 59% of Americans think the military action in Iran is excessive. The debate will be a subtext — and likely flare publicly — as thousands of activists, influencers and Republican...