OSHKOSH, Wis. -- Ted Cruz is accusing rival Donald Trump of stoking false rumours about his personal life.

The Texas senator told reporters in Wisconsin on Friday that the Republican presidential race has taken a "darker turn." Cruz is blaming Trump and "his henchmen" for spreading false rumours that Cruz has cheated on his wife, Heidi.

It's an escalation of the back-and-forth between the two. Cruz posted similar comments on Facebook.

Trump hasn't held a public event since Monday, and Cruz says the billionaire businessman is "hiding in Trump Tower" and campaigning via Twitter instead of meeting with voters.

Asked if he plans to vote for Trump should he win the Republican nomination, Cruz says, "I don't make a habit of supporting people who attack my wife and my family."