North Korea dominated the conversation between the two leaders, according to a readout of the call.
The Labour leader's warning comes after he called on Donald Trump and Kim Jong-un to hold direct talks "in the interest of sanity".
The Labour leader's intervention comes after China's president warned the United States and North Korea not to exacerbate tensions after Mr Trump said Kim would "truly regret" military action. On Thursday, Trump said his original statement "wasn't tough enough".
They agreed that North Korea must stop its provocative and escalatory behaviour, the White House said. I mean, his rhetoric might make Kim Jong-un think that he needs to strike first.
Clapper said the USA and North Korea could "blunder" into global military conflict as they exchange escalating hostilities. I'd say he's being incredibly irresponsible and he's putting us in a situation where you could have an accidental launch.
Shikhar Dhawan guides India to 329/6 on Day 1
At lunch on day two, Pandya was unbeaten on 108 off 93 balls with seven fours and eight sixes against his name. Kohli tried to stem the rot during a 84-ball innings, ended when he edged a Sandakan delivery to slip.
"They discussed the need to confront the increasingly risky situation associated with North Korea's destabilizing and escalatory behavior،" the White House said in a statement.
The statement added that Trump had "reassured" Guam Governor Eddie Calvo that the U.S. military would "ensure the safety and security of the people of Guam, along with the rest of America".
"Trump reiterated to President Macron the United States' commitment to stop the North Korean nuclear menace".
"He does something in Guam, it will be an event the likes of which nobody has seen before - what will happen in North Korea", Trump told reporters Thursday from his home in Bedminster, New Jersey.