Good Wednesday morning. Here are some of the stories making news in Washington and politics today.

_____________________

• President Trump called Joe Biden “a loser” and “a sleepy guy.” Mr. Biden called Mr. Trump “an existential threat” to the country. In the most ferocious day of attacks so far in the presidential campaign, the two traded insults as they each campaigned in Iowa, offering a preview of what a general election matchup between the two men might look like.

• There’s only so much room in the spotlight in the Democratic presidential race, leaving some candidates feeling left out. Struggling to be heard, their grumbling only gets louder.

• After Mr. Trump and Secretary of State Mike Pompeo used a loophole to sell billions in weapons to Saudi Arabia and the United Arab Emirates in May, congressional Democrats are examining whether a former arms-industry lobbyist now working in the State Department played a role in the administration’s decision.