WASHINGTON (AP) — Donald Trump has strengthened his grip on the Republican primary race and pushed tantalizingly close to a general election showdown with Hillary Clinton.

The Democratic front-runner is now 90 percent of the way to her party's nomination after four solid victories of her own Tuesday.

The Republican race now turns to Indiana, where next week's primary marks one of Texas Sen. Ted Cruz's last chances to slow Trump and push the race toward a contested convention. While Trump does need to keep winning in order to stay on his narrow path to the GOP nomination, he declared himself the party's "presumptive nominee" after Tuesday's results rolled in.

Trump was headed to Indiana Wednesday after delivering a foreign policy speech in Washington.

(Story by: Julie Pace, White House Correspondent, The Associated Press)