Source: The Washington Post - Link
But this is something new. Trump’s claim generated a lot of attention in right-leaning circles, especially after Fox News headlined its story: “Trump says he requested 10K National Guard troops at Capitol on day of riot.”
A large majority of senators — even those who did not vote to convict him at his impeachment trial — regard Trump as responsible for the riot and believe he failed to act decisively as the violence unfolded. So it would be significant if Trump actually requested the dispatch of National Guard troops at the Capitol — especially if, as Trump suggests, House Speaker Nancy Pelosi (D-Calif.) then blocked that deployment.
But it did not happen.
That Trump is lying is so easy to prove, but this will become gospel among his base.