United Kingdom, April 9 -- George Clooney has urged the White House to stop "infantile name-calling" in the face of more serious matters.

The 64-year-old star has responded after the White House criticised his acting abilities following a talk where he accused US President Donald Trump of war crimes.

In a statement to The Hollywood Reporter, Clooney wrote: "Families are losing their loved ones. Children have been incinerated. The world's economy is on a knife's edge.

"This is a time for vigorous debate at the highest levels. Not for infantile name-calling.

"I'll start. A war crime is alleged 'when there is intent to physically destroy a nation,' as defined by the Genocide Convention and the Rome Statute.

"What is the administration's...