'Triggered: How the Left Thrives on Hate and Wants to Silence Us'

A morning TV anchor stumped Donald Trump Jr. on Tuesday with a parting request to name his 'favorite Democrat' – only to hear him come back seconds later with an answer: Mitt Romney.

Romney, a first-term U.S. senator from Utah, was the Republican Party's presidential nominee in 2012. He lost to Barack Obama in a race that President Donald Trump called 'winnable.'

The elder Trump filed trademark papers for his 'Make America Great Again' slogan less than two weeks after that election, fuming about the missed opportunity to drive Obama from office.

The president has said Romney 'choked like a dog,' and routinely frames him as a stealth liberal in a party that's trending to the right.

So when CBS This Morning co-host Gayle King asked his son, 'Who is your favorite Democrat?' the most surprising thing about Trump Jr.'s answer was that it took three seconds to collect.

As Donald Trump Jr. promoted 'Triggered,' his political book released Tuesday, a 'CBS This Morning' co-host asked him to name his favorite Democrat

Trump Jr. grimaced for a moment and then said 'Mitt Romney,' naming a moderate Republican who lost the 2012 presidential election and is a frequent Trump target

'Triggered: How the Left Thrives on Hate and Wants to Silence Us' climbed to #3 among all of Amazon's book titles Tuesday morning

President Donald Trump, pictured Monday night at a Lexington, Kentucky rally, has said Mitt Romney 'choked like a dog,' and routinely frames him as a stealth liberal in a party that's trending to the right

'Mitt Romney. Mitt Romney's my favorite Democrat, Gayle. How about that?' he asked as King wrapped up an interview segment.

'No,' she chuckled back, wagging a finger.

The president's eldest son was promoting 'Triggered,' a polemic-filled book timed for release as Democrats race toward an impeachment vote in the House of Representatives.

The exercise in political flame-throwing shot up to the no. 3 slot among all of Amazon's book offerings by 9:00 a.m. on Tuesday, its first day on sale to the public.

With girlfriend Kimberly Guilfoyle in tow, he expects to barnstorm the book-media circuit this week with bare knuckles out.

'He's not the lightweight everyone wants him to be,' a source close to Trupm Jr. said Tuesday. 'He loves being underestimated.'

At the top of the Amazon chart was 'A Warning,' the forthcoming tell-all from the anonymous Trump administration official who penned a scathing New York Times op-ed a year ago. The latest installment in the 'Diary of a Wimpy Kid' kid-lit series stood at no. 2.

Trump Jr. was his usual non-wimpy self on TV, venting about 'woke goalposts' that 'keep moving' as progressives gain ground in America's culture wars.

Trump Jr., a red-meat conservative, mugged for the camera on Tuesday with an exaggerated grimace when he was asked to praise a Democrat

'CBS This Morning' got the first book-release-day interview with the president's eldest son

He clobbered the mass media for partisanship, Democrats for impeachment power-hoarding, and athletes who set new records in women's sports despite being born male.

The Trump scion who runs the family real estate business with his brother Eric sounded like a candidate, but insisted he's not running for anything – yet.

'I'm interested in winning 2020 for my father right now. We'll worry about everything else later,' Trump Jr. said. 'I don't ever rule anything out.'

'Right now, I like the campaigning part,' he said. 'I actually enjoy some of that fight. I like getting out there and being with real people and seeing the difference my father and his policies are making in their lives.'

But 'I don't know, right now, at this stage of my life, that I would like the day-job component of it,' he acknowledged.

Trump Jr. told a Bloomberg Radio interviewer in March that a political future could unfold on its own, without any rush.'

'My father decided to get into politics at 68. I'm 41, I've got plenty of time,' he said.