President Trump's approval has cratered to an all-time low of 32% in a Quinnipiac poll, with three issues—war in Iran, tariffs, and monument obsession—dragging his numbers down and threatening the GOP's economic advantage heading into the midterms.

Background

Even longtime Trump insiders privately acknowledge he's trapped by policies that remain deeply unpopular with the public. A Reuters/Ipsos poll this week found voters now split on which party is better for the...