INDIANAPOLIS (AP) – Texas Sen. Ted Cruz ended his presidential campaign Tuesday, eliminating the biggest impediment to Donald Trump’s march to the Republican nomination.

The conservative tea party firebrand who tried to cast himself as the only viable alternative to Trump ended his campaign after a stinging defeat in Indiana’s Republican primary.

“It appears that path has been foreclosed,” Cruz told supporters in Indianapolis. “Together, we left it all on the field of Indiana. We gave it everything we’ve got, but the voters chose another path, and so with a heavy heart but with boundless optimism for the long-term future of our nation, we are suspending our campaign.”

Had he succeeded in his quest, Cruz would have been the first U.S. president of Hispanic descent, although he often downplayed his heritage on the campaign trail, instead, touting the need for tougher immigration laws, for a border wall along the border with Mexico, protecting gun rights, repealing President Barack Obama’s health care law and instituting a flat tax.

Cruz argued he was the only true conservative in the race, building on his reputation in the Senate where he clashed both with Democrats and members of his own party over his ideological stubbornness. Cruz railed against what he called the “Washington cartel,” trying to appeal to an electorate that is craving political outsiders.