The US President claimed recent leaks from Washington are "absolutely real but the news is fake"
Donald Trump has announced he will introduce an executive action next week to 'comprehensively protect our country'.
Last week, a US appeals court upheld the suspension of President Trump's controversial travel ban.
The order - which temporarily blocked people from seven predominantly Muslim countries entering the US, as well as temporarily suspending the US refugee programme - led to protests across the US as well as a number of legal actions.
In a lengthy and lively press conference today, President Trump said: "Parts of our necessary and constitutional actions were blocked by judges' - in my opinion - incorrect and unsafe ruling.
"I will not back down from defending our country... I got elected on defence of our country," he added.
He renewed his attack on the court that blocked his executive order, saying "that circuit is in chaos... and that circuit is frankly in turmoil."
He said 'extreme vetting' will be put in place for people entering the US, and that it already is in place in some parts of the country.
"We're issuing a new executive action next week that will comprehensively protect our country," he explained.
However, President Trump also insisted that they will appeal the previous court ruling.
Trump praised his own record in office so far, saying some 'very big things' will be announced next week.
"There has never been a presidency that has done so much in such a short period of time... and we haven't really started the big work yet".
The US President also appeared to criticise his predecessor Barack Obama's time in office, telling reporters "I just want you to know I inherited a mess".
He devoted much of the conference to again attacking the media, arguing "many of our nations' reporters and folks will not tell you the truth, and will not treat the wonderful people of our country with the respect they deserve.
"The level of dishonesty is out of control," he added.
He also observed: "I hope going forward things can be a little bit different and maybe get along a little bit better. Maybe it's not. That's OK too.
"Much of the media in Washington DC, along with New York, Los Angeles in particular speaks not for the people but for those profiting off a obviously very broken system."
He suggested recent leaks from Washington are "absolutely real but the news is fake".
President Trump was questioned by one reporter over his inaccurate claim earlier in the news conference that he enjoyed the biggest electoral college win since Ronald Reagan.
"I'm talking about Republican," Mr Trump claimed. "I was given that information - we had a very, very big margin... It was a very substantial victory."