Mueller wants to know whether Trump obstructed justice by lying about Don Jr meeting: report

Special counsel Robert Mueller is probing whether President Donald Trump tried to obstruct investigators by concealing the purpose of his son's campaign meeting with Russia.

Prosecutors working under Mueller are investigating what the president knew about the meeting between Donald Trump Jr., two of his other top campaign officials and a Russian attorney promising damaging information about Hillary Clinton, reported NBC News.

Three sources also told the network that Mueller wants to determine whether Trump intended to conceal the purpose of the meeting -- which was clearly stated in an email exchange posted online by the president's son days after news of the meeting first broke.

Trump Jr. invited his brother-in-law Jared Kushner and campaign chairman Paul Manafort to the meeting, where they discussed economic sanctions imposed against some Russian oligarchs under the Magnitsky Act.

The White House confirmed at the time that Trump had "weighed in" on the initial response to the New York Times report while flying home from the G20 meeting, where he'd met privately with Putin.

That response described the meeting as a "short introductory meeting" where they "primarily discussed a program about the adoption of Russian children that was active and popular with American families years ago and was since ended by the Russian government."

Their explanation quickly fell apart over the coming days and was disproved by the emails released by Trump Jr.