The Republicans are trying to stop Trump from campaigning in Georgia.
After the elections, Trump's status in the GOP has plummeted.
Walker is a Republican in the Senate.
According to Rolling Stone, Donald Trump is angry that top Republicans are trying to stop him from going to Georgia to campaign for their candidate.
The election will be decided in a second round after neither candidate received more than 50% of the vote.
If the Democrats add to their majority in the Senate, it will be determined.
According to the sources, the former president has said he will react poorly if the party invites Ron DeSantis, the Florida governor widely seen as Trump's main challenger for the 2024 GOP nomination.
In order to solidify his hold over the Republican Party, Trump endorsed hundreds of candidates in the mid-term elections. The strategy appears to have backfired, as many underperformed in key races and the Democrats did not lose control of the Senate or the House.
The Republican Party's two Georgia Senate run offs last year were blamed on Trump's promotion of election fraud conspiracy theories. It was thought that it put off party supporters from voting.
Despite calling for a near total ban on the procedure on the campaign trail, Walker's campaign has been damaged by previous reports that he paid for a former girlfriend to have an abortion.
Business Insider has an article on it.