Trump floats election 'delay' amid claims of voting fraud

He knows he will lose so he has to make these false accusations and spread fear. There is no evidence of voting fraud of any sizeable impact.

Only the states or Congress (both Houses) can change the election date and nobody can change he inauguration date.

Here is a good article n this subject:
https://constitutioncenter.org/blog/does-the-constitution-allow-for-a-delayed-presidential-election

First: Congress, not the president, has the power to move Election Day. And even if Congress did postpone the vote, the Constitution would terminate Trump’s term on Jan. 20, 2021. If Trump sought to cancel the election and remain in office past that point, then, he would require not just a congressional act but a constitutional amendment.

The 20th amendment to the U.S. constitution states that the current president’s four-year term ends at noon on Jan. 20.

So the election couldn’t be put off by much more than two months without incurring the risk of leaving the U.S. without a president or vice president come Jan. 20, and leaving Congress the chaotic task of having the Speaker of the House temporarily assume the Presidency while figuring out how to rectify the absence of a duly-elected chief executive.

Altering that Jan. 20 deadline would require amending the U.S. Constitution in a matter of months, a virtually impossible feat.