Republican presidential front-runner Donald Trump all but declared victory in the GOP presidential primary, calling on his GOP rivals to drop out and help heal the Republican Party, after a clean five-state sweep on Tuesday.

“I consider myself the presumptive nominee,” Trump said in remarks to the press at Trump Tower. “Honestly, Senator Cruz and Governor Kasich should really get out of the race. They have no path to victory. They should get out of the race, and we should heal the Republican Party and bring the Republican Party together.”

Trump compared himself to a boxer, winning round after round by a knockout. “When the boxer knocks out the other boxer, you don’t have to wait around for a decision,” he asserted.

But Cruz showed no sign of quitting. “Tonight, Donald Trump is expected to have a good night,” Cruz told supporters in Knightstown, Indiana, Tuesday evening. “Tonight this campaign moves back to more favorable terrain.”

Trump scored victories in Pennsylvania, Maryland, Connecticut, Rhode Island and Delaware. His margin of victory appeared to be even larger than in his home state of New York last week, giving him a big boost going into the important contest in Indiana next Teusday.

“This is a far bigger win than what we expected,” the Republican presidential front-runner said. “This one may be the biggest of them all. This one is a diverse victory… I am so honored, This was to me our biggest night.”

Answering questions from reporters, Trump previewed his foreign policy speech – the first major policy speech since his address to AIPAC last month – he is expected to deliver in Washington, D.C., on Wednesday.

“The single biggest threat to our country is nuclear weapons, and we cannot let Iran get a nuclear weapon,” Trump stated.