But they can't physically initiate WWIII, UNLIKE YOU

President Trumps tweets from Sunday: 

The joint statement of former presidential candidates John McCain & Lindsey Graham is wrong – they are sadly weak on immigration,” Trump said.
The two … Senators should focus their energies on ISIS, illegal immigration and border security instead of always looking to start World War III,” he added, using an acronym for Daesh (ISIL) terrorist group.
These two old farts are an utter sham of imbecility, Grand Standing for more War, for ever. But they have no official power to follow through their policies.
However the POTUS is the one who can initiate WWIII realistically, by....giving SPEECHES which subconsciously wip up militarism and jingoism with a military bent.
The POTUS can 'rebuild the military' in the hope and expectation of further and better military confrontation which is ill defined, but which could eventually lead to WWIII.
Or setting up 'terrorist safe zones' in Syria without consulting the Russians, the Iranians and the Chinese....3 governments who have guaranteed support for the legitimate moderate, secular government in Damascus.
Banning people from certain troubled countries in the Developing World in the Middle East is good as a stop gap measure, if it prevents CIA/State Department Deep State actors from those countries tooing and froing between there and the USA....the nauseating sight of Syrian terrorists in suits lobbying in Capital Hill, by way of just one example......never mind the millions of other 'exchange' programs run by the CIA/State Department.
On the other hand if this is a precursor to the Pentagon 7 countries in 5 years regime change plan from 2001.....isolate them, separate them, vilify them first policy, then not good.