With less than a week to go before the first-in-the-country Iowa caucuses two challengers to Donald Trump make their case

Trump has decided the identity of his running mate in the presidential election but is not yet ready to announce it, he told a Fox News town hall in Iowa on Wednesday.

Asked who he would pick as vice-president, Trump replied: “Well, I can’t tell you that, really. I mean, I know who it’s going to be but –”
Co-host Bret Baier entreated: “Give us a hint.”

Trump joked in response: “We’ll do another show some time.”

Donald Trump began his Iowa town hall on Fox News by highlighting an incident in which Chris Christie was caught on a hot mic. “She’s going to get smoked, and you and I both know it,” the former New Jersey governor was heard saying on his campaign’s live stream. “She’s not up to this.”

It is widely assumed that Christie, who dropped out of the Republican primary race today, was referring to Nikki Haley, perceived as Trump’s principal rival in New Hampshire.

Trump said: “Chris Christie was in and he got a hot mic I heard about. I thought the bigger story wasn’t actually the fact that he dropped out – nobody cared too much about that – but he had a hot mic where he was talking to somebody about the weather and he happened to say she doesn’t have what it takes, she’ll be creamed in the election.”

The former president added: “I know her very well and I happen to believe that Chris Christie’s right. That’s one of the few things he’s been right about actually.”

Trump admitted he didn’t known whether Christie’s departure would change the dynamic of the race and complained that independents and Democrats can vote in the Republican primary. “Even with that, I think we’ll win substantially,” he added.