CLEVELAND: Hillary Clinton took a monumental step toward clinching the Democratic party’s White House nomination, while Donald Trump’s seemingly unstoppable rush to victory hit a bump in Ohio. Trump on Tuesday won key Republican primaries in Illinois, North Carolina and Florida — where he thumped home state Senator Marco Rubio, who immediately announced he was suspending his presidential campaign. “This was an amazing evening,” a buoyant Trump told supporters. “We’re going to win, win, win and we’re not stopping.” Rubio’s loss was a major setback for Republicans trying to stop the bellicose businessman, whose populist anti-immigrant, anti-Muslim stance they fear will split the party. The 69-year-old Trump was clinging to a narrow lead in Missouri with nearly all of the votes counted, but was denied a clean sweep by Ohio Governor John Kasich, who carried his home state, a key general election battleground. Trump may now struggle to reach the 1,237 delegates necessary to avoid a challenge at the party’s nominating convention in July in Cleveland. “The bottom line after tonight: it looks like Trump will not have a majority of delegates in July,” said Paul Beck, a professor of political science at Ohio State University.