Donald Trump has stepped up his attacks on Attorney General Jeff Sessions over the indictments of two Republican congressman.
The president suggested that the Department of Justice's move had put his party's success in the mid-term elections in jeopardy.
Mr Trump tweeted: "Obama era investigations, of two very popular Republican Congressmen were brought to a well publicized charge, just ahead of the Mid-Terms, by the Jeff Sessions Justice Department."
He added: "Two easy wins now in doubt because there is not enough time. Good job Jeff……"
The first two Republicans to endorse Mr Trump in the Republican presidential primaries were indicted on separate charges in August.
Duncan Hunter of California faces accusations that include spending campaign funds for personal expenses, while Chris Collins of New York has been charged with insider trading.
Both have insisted they are innocent.
Two long running, Obama era, investigations of two very popular Republican Congressmen were brought to a well publicized charge, just ahead of the Mid-Terms, by the Jeff Sessions Justice Department. Two easy wins now in doubt because there is not enough time. Good job Jeff……
— Donald J. Trump (@realDonaldTrump) September 3, 2018
Mr Trump's attack on Mr Sessions was quickly followed by a post in which he mocked the former US secretary of state John Kerry.
He wrote: "I see that John Kerry, the father of the now terminated Iran deal, is thinking of running for president.
"I should only be so lucky – although the field that is currently assembling looks really good – FOR ME!"
Mr Trump's fresh attack on Mr Sessions was the latest development in his long-running feud with the attorney general.
The president has repeatedly complained after Mr Sessions recused himself from the investigation into possible Russian collusion in 2017.
Mr Trump asked the attorney general to end special counsel Robert Mueller's probe on 1 August.
He tweeted: "This is a terrible situation and Attorney General Jeff Sessions should stop this Rigged Witch Hunt right now, before it continues to stain our country any further.
"Bob Mueller is totally conflicted, and his 17 Angry Democrats that are doing his dirty work are a disgrace to the USA!"
Mr Trump has also pressed Mr Sessions to investigate his perceived enemies and has accused him of failing to take control of the justice department.
Mr Session said he "will not be improperly influenced by political considerations" in August, hours after Mr Trump had critcised him in a interview on Fox News.
I see that John Kerry, the father of the now terminated Iran deal, is thinking of running for President. I should only be so lucky – although the field that is currently assembling looks really good – FOR ME!
— Donald J. Trump (@realDonaldTrump) September 3, 2018
The attorney general has told associates that he has no intention of leaving his job voluntarily despite Mr Trump's constant criticism.
A spokeswoman for Mr Sessions declined to comment, and the White House did not immediately respond to a request for comment.
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Mr Trump suggested Mr Sessions could lose his job in July last year when he said "time will tell" what happens to him.
The president said in an interview with the Wall Street Journal that he was "very disappointed" in Mr Sessions and was "looking" at firing him.
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