GOP presidential candidate Carly Fiorina is now the second candidate challenging GOP frontrunner Donald Trump to a debate ahead of the Iowa caucus.

“My campaign will also donate $1.5 million to veterans’ cause to join debate Saturday in Sioux City, @tedcruz @realDonaldTrump,” Fiorina posted on Twitter, adding, “Upping the ante, I’m free tomorrow at 8pm, @realDonaldTrump. My campaign will give $2mm to veterans’ cause to debate at Drake U.”

Fiorina is in the earlier debate hosted by Fox News on Thursday night, so she will be finished in time for Trump’s event benefiting veterans at Drake University and wants to donate $2 million to the cause in order to debate him there.

She first offered the $1.5 million to join in on a debate between Sen. Ted Cruz (R-TX) and Trump, which Cruz has said he reserved the Western Iowa Tech for Saturday at 8 P.M. in Sioux City, Iowa.

Florina’s offer comes after a Super PAC backing Cruz offered to donate $1.5 million to veterans if Trump accepts Cruz’s invitation to debate before the Iowa Caucus.