'Typical Trumpian nonsense': Trump biographer blows up president's latest lies about his tax returns

President Donald Trump is still refusing to release his tax returns, despite having pledged to do so for years now.

Trump biographer David Cay Johnston, who has in the past written extensively on ways that the American tax code is rigged to benefit wealthy Americans, appeared on CNN Monday to knock down the president's latest excuses for not showing the public his taxes.

After told of White House press secretary Sarah Huckabee Sanders claiming that members of Congress aren't smart enough to properly review Trump's taxes, Johnston wasted no time in shooting down this particular talking point.

"The Congressional Joint Committee on Taxation employs about 70 tax lawyers and tax accountants who are among the very best experts on this in the country," Johnston said. "Furthermore, they can bring in, if necessary, consultants from the tax avoidance world to help them go over the returns. This is just typical Trumpian nonsense, it has no basis in fact."

Johnston then said that the administration has no legal wiggle room to argue that Congress has no right to request the president's taxes.

"The law simply says that -- upon written request of the Chairman of Ways and Means, senate finance, or the congressional employee who is chief of staff at the Joint Committee on Taxation -- the returns and related information shall be turned over," he explained.

Watch the video below.