(Want to get this briefing by email? Here’s the sign-up.) Good morning. Here’s what you need to know: • Washington will reimpose stringent sanctions on Tehran that it had waived as part of the 2015 nuclear accord, after President…

Primary elections in four Republican-leaning states rattled Congress on Tuesday night, as voters ejected a sitting member of the House and set up intense campaigns for the Senate in several battlegrounds. Republicans averted a worst-case scenario — the nomination…