A leading commentator has insisted it's "implausible" Donald Trump did not know his son was due to meet an official who supposedly represented the Russian government.
The disclosure of emails denoting Donald Trump Jr's meeting with a Russian lawyer linked to the Kremlin has engulfed the White House in a major political firestorm.
The chain of emails which led to the meeting - believed to have included Jared Kushner and Trump campaign manager Paul Manafort - began when a British intermediary called Rob Goldstone promised Trump Jr incriminating information on Hillary Clinton - and the US President's son replied "I love it."
Trump Jr maintained in an interview in Fox News on Tuesday his father didn't know about the meeting.
But Bill Barnard, a US political commentator and author of Dixiecrats & Democrats, said this is "implausible" in an interview with Julia Hartley-Brewer.
He said: "Two questions - what does he [Trump Jr] do and what does he not do?
"He goes ahead with the meeting and invites Manafort and Kushner to the meeting. He expressed no surprise on being told the Russian government is helping the campaign.
"He doesn’t alert the FBI or authorities, which every member of other campaigns said they would have done.
"And if you believe him - his record for truthfulness is not overwhelming - he didn’t tell his father and that seems implausible, on the face of it."