Welcome to From the Politics Desk , a daily newsletter that brings you the NBC News Politics team’s latest reporting and analysis from the White House, Capitol Hill and the campaign trail. In today’s edition, Jonathan Allen explores the delicate balance Republicans are attempting to strike for the midterms. Plus, Sahil Kapur digs into how Democrats have adopted a more confrontational attitude toward the GOP over time. Sign up to receive this newsletter in your inbox every weekday here. — Adam Wollner Trump presents a midterm dilemma for Republicans Analysis by Jonathan Allen On this, President Donald Trump and Democratic leaders seem to agree: the midterm elections will be a referendum on his performance in office. “I am on the ballot, and my voters love me,” Trump recently told NBC News , metaphorically referring to the shadow he promises to cast when voters go to the polls this fall. That puts a squeeze on congressional Republicans, who are trying to hold their narrow House and Senate majorities.…