There’s no denying that President Donald Trump has a vise-like hold over the current Republican Party. Time and again, he has shown an uncanny talent to chuck chaos at even bipartisan bills, like the one House Speaker Mike Johnson sent to the White House on Monday only to be met with “yawn” from his fellow Republican Trump. At the same time, it now looks like Trump and Johnson may end up lashing an annual must-pass, traditionally bipartisan defense bill to a Trump pet project that would make it harder for Americans to vote in this fall’s elections—and force lawmakers to...