His father is in the midst of a run for the White House.

But for Donald Trump Jr., a different kind of run took priority over the campaign trail on Tuesday morning - the school run.

The 38-year-old walked with his five children through the streets of Manhattan as his eldest - nine-year-old daughter Kai Madison Trump and seven-year-old son Donald Trump III - prepared to start their first classes of the new semester.

Dressed in a suit he held the hands of two of his sons, Tristan and Spencer, while his wife Vanessa walked beside them, carrying their youngest daughter Chloe in her arms.

Donald Trump Jr walks with his wife Vanessa (second from right) and their five children; (left to right) Donald III, Tristan, Spencer, Chloe (in her mother's arms) and Kai Madison. They all walked through the streets of Manhattan on the first day of school

It was a busy morning for Donald Jr, as he also appeared on The Mike Gallagher Show.

He told the conservative radio host for the nationally syndicated broadcast that Hillary Clinton's health was 'fair game'.

Gallagher asked him: 'I wonder about your feelings about [Hillary Clinton]'s health. She invoked her health as a reason why she didn't remember a lot of stuff that the FBI was asking her.

'She had these really awful coughing jags yesterday in Cleveland. There's a whole list of these coughing jags. Some say that's a distraction, let's not take our eye off the ball. Do you think Mrs. Clinton's health is fair game?'

Dressed in a suit he held the hands of two of his sons, Tristan and Spencerm while his wife Vanessa walked beside them, carrying their youngest daughter Chloe

Donald Jr responded: 'Of course it is. You need somebody who is going to be able to do this. Listen, if there is something that no one is ever going to say it's my father doesn't have the energy to do this job

'I don't think you've ever seen a presidential candidate that has been as hidden from the people who are supposed to be her would-be constituents than Hillary Clinton and you've got to question why that is.'

As he guided his children to school, his father Donald Trump and sister Ivanka were busy speaking to voters at a town hall in Virginia Beach, Virginia.

The Republican presidential candidate hammered the latest revelations about the Clinton email scandal – including that a private company worker destroyed Clinton emails using special software after revelations that Clinton was maintaining a private server.