DETROIT (AP) — Donald Trump was under fire even before taking the debate stage Thursday night.

The Republican front-runner walked into the Fox Theater after being targeted for much of the day by the GOP's last two presidential nominees, who warned voters across the nation that Trump must be stopped.

His three rivals — Marco Rubio, Ted Cruz and John Kasich — set out to keep Trump on his heels on what they hope will be remembered as a pivotal day in the 2016 contest. Knowing he would be attacked, Trump warned voters ahead of time that his tone might have to be less-than-presidential.

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