Donald Trump Jr. and Eric Trump on Father, Donald Trump: 'Tough' But 'Fair'

Donald Trump Jr. and Eric Trump say their dad is "ready" to be president.

“People have just embraced us so much, and it means so much when you see that kind of enthusiasm,” Donald Jr. added.

While Donald Trump’s campaign has inspired some, facing harsh criticism is new for the children of Donald Trump, and Eric admits it isn’t always easy.

“It’s hard. You always want to defend your father. He’s our best friend and we love him to death,” Eric Trump told ABC News’ George Stephanopoulus and Robin Roberts. “But if you’re running for commander-in-chief of the free world, you better have thick skin. You have to get used to that. That’s just the nature of politics.”

In spite of that, both children agree that their father is "ready."

“He’s doing it and doing it well,” Donald Jr said.

In the latest Des Moines Register-Bloomberg Politics poll, the real estate mogul holds a 5-point lead over main GOP rival, Ted Cruz.