US President Donald Trump said on Sunday that he is not considering firing special counsel Robert Mueller.

Mueller is investigating allegations of Russian interference in the last year’s US presidential election and collusion between the Trump campaign and Moscow, Xinhua news agency reported.

When asked if he was considering dismissing Mueller, Trump responded, “No, I’m not,” and did not elaborate on the issue.

Democratic lawmakers have raised concern that Trump might fire Mueller.

The President, however, criticised the fact that Mueller’s team had gained access to tens of thousands of emails sent and received by officials from Trump’s transition team before the start of the presidency.

Trump said it was “not looking good.”

Mueller’s team received those emails from the General Services Administration that had housed Trump’s transition team.

In a letter to several congressional panels on Saturday, a lawyer for the transition accused Mueller of illegally obtaining the emails.

In response, a spokesman for Mueller said the emails were obtained appropriately.