Mr Giuliani took an aggressive stance as the Washington Post reported that Roger Stone, a onetime Trump advisor, acknowledged meeting Russians about Ms Clinton
Trump lawyer calls for inquiry on Mueller's Russia probe
Donald Trump's personal lawyer on Sunday called for an investigation into special counsel Robert Mueller's Russia probe, claiming it was tainted from the outset under former FBI director James Comey.
"We want the Mueller probe to be investigated the way the Trump administration has been investigated," Rudy Giuliani said on CNN's "State of the Union."
"This is a case where it's crying out for someone to investigate the investigators," he later told CBS.
Giuliani's comments were the latest in a barrage of attacks on the probe by the president and his lawyers as Mueller appears to be nearing a conclusion to his investigation into possible collusion between Trump's campaign and Moscow.
"WITCH HUNT! There was no Russian Collusion. Oh, I see, there was no Russian Collusion, so now they look for obstruction on the no Russian Collusion. The phoney Russian Collusion was a made up Hoax," Trump tweeted on Sunday.
"Too bad they didn't look at Crooked Hillary like this. Double Standard!" he added, referring to his 2016 Democratic presidential rival Hillary Clinton.
The Washington Post reported Sunday that Mueller is pressing to wrap up his findings by the end of summer and, in the words of former Republican leader Newt Gingrich, Trump and his allies were "prepared for war."
"We want to see if we can have the investigation and special counsel declared illegal and unauthorized," Giuliani, a former New York mayor and federal prosecutor, told the Post in an interview Friday.
Mueller has been investigating possible obstruction of justice as well as contacts between Trump campaign officials and a Russian effort to sway the 2016 presidential race in Trump's favour.
So far, 20 people have been indicted and at least four are cooperating with Mueller's investigators.
The Post reported Sunday that Roger Stone, a onetime Trump advisor, has acknowledged meeting a Russian national who was offering dirt on Clinton in May 2016, but said the man wanted money and nothing came of it.