Just read an article on CNN:

Here is some of it:There is a pattern of conduct with Trump. Throughout his candidacy -- and his presidency -- he has said things that are not provable, at best, and not true, at worst.
 -He saw Muslims celebrating on the rooftops in northern New Jersey on September 11, 2001.
-Evidence that President Barack Obama might not have been born in the United States had to be brought to his attention. (although he claimed to have his investigators looking into it)
-Three to 5 million people voted illegally in the 2016 election.
-His inauguration crowd was the largest ever recorded.
-Obama had wiretapped Trump Tower during the 2016 campaign.

"The Washington Post's Fact-Checker counted 836 false or misleading claims in Trump's first six months in office, an an average of more than four a day. The New York Times' "Trump's Lies" database shows that the President lied or made a false claim in each of his first 40 days in office."
"Of course, the truth as you might see it isn't the same thing as the plain, old truth. And if Trump is willing to lie about something so minor as phone calls, what else is he willing to stretch -- or break -- the truth about?
 That's why the deceptions revealed Wednesday matter. And they (should) matter a lot."