The gauntlet has been thrown down!

Ben Schreckinger reports at Politico,

Ted Cruz criticized Donald Trump’s withdrawal from Thursday night’s presidential debate and challenged the businessman to debate one-on-one in the coming days.
“Give the Republican primary voters the right to see a fair and policy-focused debate, not simply insults,” Cruz said on the Mark Levin radio show Tuesday night.

He proposed a 90-minute debate to happen before the Iowa caucuses on Monday.

Earlier on Tuesday, Trump said at a press conference here that he would not participate in Thursday’s Fox News debate because he believes co-moderator Megyn Kelly is biased against him and because he found Fox’s response to his concerns childish.

Cruz said that decision cast doubt on Trump's ability to serve as commander in chief. “If he thinks Megyn Kelly is so scary what exactly does he think he’d do with Vladimir Putin?” asked the senator.

Levin, who initially embraced Trump’s candidacy, has recently turned against the businessman over his questioning of Cruz’s constitutional eligibility for the presidency, and Cruz allowed for the possibility that Trump would object to Levin’s involvement.

“If he’s scared of you, he can name his own moderator,” Cruz told the host.

Levin proposed a free-for-all debate format, with no moderation except to intervene for commercial breaks, which he likened to both the Lincoln-Douglas debates and “a cage match.” Levin called on the Trump campaign to accept Cruz’s challenge.

At the end of the segment, the host also opened the proposed debate to the rest of the field. “Well that’s two presidential candidates,” he said. “Anybody else listening? You can come in too.”
“I would encourage Marco Rubio to call in if he wishes. Or Kasich or Jeb Bush,” added Levin after the break.
Representatives of Trump's campaign did not immediately respond to a request for comment on Cruz's challenge.