President Donald Trump on Tuesday announced that the first-ever GOP midterm convention will be held in Dallas, Texas, on Sept. 9-10. File Photo by Samuel Corum/UPI | License Photo

July 1 (UPI) -- President Donald Trump has announced that the Republican Party will hold a midterm convention, an unprecedented development seemingly aimed at mobilizing the GOP base ahead of November's midterm elections.

The convention highlights the importance Trump has placed on the midterms, framing Republican control as necessary to protecting his presidency and the implementation of his America First agenda. He has warned Republicans that if they lose the House, Democrats would seek to impeach him and use their investigative powers to probe him, his family and other GOP officials.

Trump announced the convention Tuesday on his Truth Social media platform, saying it will be held Sept. 9-10 in Dallas, Texas.

"It will be fantastic! It has never been done before, and will be a truly Historic Event," he said, describing it as an opportunity to promote his administration's purported accomplishments.