Former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE on Thursday defended special counsel Robert Mueller after President Trump said Mueller was leading an investigation riddled with conflicts of interest.

"There is NO basis to question the integrity of Mueller or those serving with him in the special counsel's office. And no conflicts either," Holder, who served under former President Obama, said on Twitter Thursday.

"Trump cannot define or constrain Mueller investigation. If he tries to do so this creates issues of constitutional and criminal dimension," he added.

There is NO basis to question the integrity of Mueller or those serving with him in the special counsel's office. And no conflicts either — Eric Holder (@EricHolder) July 21, 2017

Trump cannot define or constrain Mueller investigation. If he tries to do so this creates issues of constitutional and criminal dimension. — Eric Holder (@EricHolder) July 21, 2017

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Mueller was appointed special counsel in the ongoing investigation into Russian interference in the 2016 presidential election after former FBI Director James Comey was abruptly fired earlier this year.

Trump told The New York Times in an interview on Wednesday that Mueller was leading an investigation riddled with conflicts of interest and said the special counsel should not expand the probe to include the financial dealings of Trump's family.

The Washington Post and The New York Times separately reported on Thursday that the president's attorneys are also examining potential conflicts they could use to undercut or discredit the special counsel investigation.

Among the conflicts of interest they're looking at are investigators' past donations to Democratic political candidates and Mueller's relationship with Comey, who was previously charged with leading the Russia probe, according to the Times.