Former President Trump is taking on Senate GOP Leader Mitch McConnell (R-Ky.) and his leadership team by calling on Republican lawmakers to reject a compromise on border security. The runaway front-runner for the GOP presidential nomination is also setting up a crucial battle over both his party’s future and Ukraine‚ as precious aid to that country is tied to the border deal along with help for Israel and the Indo-Pacific. Trump has said Republicans should say “no” to...