US President Donald Trump said that Congress "can't impeach" him over the findings of the Mueller report into Russian election meddling and his alleged attempts to hamper the investigation.

Insisting that he did nothing wrong, Mr Trump also denied a portrait of dysfunction in the White House where disobedient aides are said to have saved him from committing obstruction of justice by refusing to carry out his instructions.

Asked by reporters at a White House Easter egg event for children whether the prospect of impeachment worries him, Mr Trump replied: "Not even a little bit."

"Only high crimes and misdemeanors can lead to impeachment. There were no crimes by me (No Collusion, No Obstruction), so you can't impeach," Mr Trump stated earlier on Twitter.

However, Democrats believe the Mueller report has revealed serious wrongdoing by the president and have yet to decide on impeachment.

The report confirmed that Russian operatives had attempted to interfere in the 2016 election to help Mr Trump beat Democratic candidate Hillary Clinton, including by hacking into email accounts.

The report also found that Mr Trump's campaign took advantage of the impact on Mrs Clinton, but did not deliberately reach out to collude with the Russians.

During the investigation, Mr Trump repeatedly tried to hamper Mr Mueller's work, the report said.

But Mr Mueller did not rule one way or the other on whether Mr Trump had committed the crime of obstruction of justice, effectively leaving Congress to take up the matter or not.

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Democrats, who control the lower house, are so far mostly holding off from calling for impeachment proceedings, which would be immensely divisive ahead of 2020 presidential elections.

However, Democratic 2020 hopeful Kamala Harris said during a presidential town hall broadcast on CNN last night that she believes "Congress should take the steps towards impeachment".

That made her the second candidate to do so, after Senator Elizabeth Warren called for impeachment proceedings last week.

Meanwhile, powerful committees plan to dig further into the scandal and are pushing to be given the whole Mueller report, including parts currently blacked out for security or legal reasons.

House Speaker Nancy Pelosi said: "While our views range from proceeding to investigate the findings of the Mueller report or proceeding directly to impeachment, we all firmly agree that we should proceed down a path of finding the truth."

House Judiciary Committee Chairman Jerry Nadler issued a subpoena yesterday for former White House counsel Don McGahn to testify.

Mr McGahn was a key witness in the Mueller probe and will likely be asked about Mr Trump's alleged obstruction of justice.

"The President's efforts to influence the investigation were mostly unsuccessful, but that is largely because the persons who surrounded the President declined to carry out orders or accede to his requests," Mr Mueller wrote in his report.

Even though the aides allegedly disobeyed him so that they could prevent more serious damage, Mr Trump denied that any sort of insubordination would be possible.

"Nobody disobeys my orders," he said at the Easter egg event.

In addition to the ongoing fight over what to do about the Mueller report, Mr Trump faces danger from congressional probes into his business interests and tax history, which in a break with tradition he has refused to make public.

Yesterday, Mr Trump and his businesses filed a Washington federal court lawsuit to try and block a subpoena issued by the House Oversight and Reform Committee to gain access to their financial records.

"The Democratic Party, with its newfound control of the US House of Representatives, has declared all-out political war against President Donald J Trump," the filing said.