John Dowd is reported to have concluded that Mr Trump was increasingly ignoring his advice.
Other reports say Mr Trump had lost confidence in Mr Dowd's ability to handle special counsel Robert Mueller.
In an email to The Washington Post, Mr Dowd wrote: "I love the president and wish him well."
The special counsel is investigating possible links between Mr Trump's associates and Russia, as well as whether the president has obstructed the inquiry.
Source: RadioNZ || March 22, 2018 |||