"The Dems talk of foreign influence in voting, but they know that Mail-in Voting is an easy way for foreign countries to enter the race", wrote the president while referring to complaints that Russian Federation influenced the 2016 election that Mr Trump won. The law is what it is.
Many lawmakers from both parties very quickly said the likelihood an election would be delayed is very low.
Trump ally and Senate judiciary chairman Sen.
Indeed, Trump confidant Jerry Falwell Jr., the president of Liberty University, said he would support Trump's call to delay the election "until things are normal so people can walk in". I wish we would move it up. "But it's not going to change", Rubio added.
"Never in the history of this country, through wars, depressions and the Civil War, have we ever not had a federally scheduled election on time. And people should have confidence in it". Securing enough votes in favor of this now appears far-fetched, as the House of Representatives is now under the control of the Democratic Party, while the Senate has only a slim Republican majority.
Senator Chuck Grassley of Iowa also told CNN: "All I can say is that, it doesn't matter what one individual in this country says". It is a law that dates back to the middle of the 1800s and has not been changed since.
Voting experts say there is no evidence to back up Trump's claim.
The president's tweet stems from his long-running allegations, without evidence, that mail-in voting is unreliable and riddled with fraud.
In a scathing opinion piece in The New York Times published online Thursday, the Northwestern University law professor points to what ignited his newfound ire with the president: a tweet Trump sent out shortly after news broke Thursday morning that the US economy had suffered its biggest recorded contraction ever last quarter.
"You're sending out hundreds of millions of universal mail-in ballots", said Trump.
The president added: "It will be a great embarrassment to the USA".
"I don't want to be waiting around for weeks and months and literally, potentially if you really did it right, years, because you'll never know", Trump told reporters. Dusty Johnson, a conservative House Republican from South Dakota, wrote on Twitter.
"We will find a way to do that again this November 3".
But it was another Trump tweet on Thursday that caught my attention, one that signaled how he might seek to discredit the results of an election he can't postpone. "And I will oppose any attempts to delay the #2020Election".
Democrats, including Biden, have already begun preparations to protect voters and the election amid fears that Trump will try to interfere with the November election. And Republican leaders briefly raised concerns past year when Trump was caught pressuring Ukrainian leaders to investigate Biden - an episode that would ultimately lead to his impeachment.