Donald Trump says he isn't going to change, or pivot, that his supporters won't trust him if he does.
But his foreign policy stances have been attacked repeatedly, especially from members of this own party.
Earlier this month, fifty former Republican national security advisors warned that Donald Trump would be the "most reckless president in US history".
Our U.S. correspondent Priscilla Huff has more on the questions about Donald Trump's foreign policy, starting with Hillary Clinton:
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"Do you really think Donald Trump has the temperament to be commander-in-chief?"
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Rival Hillary Clinton has repeated criticized the Republican nominee.
- but in this unpredictable American presidential election,
now people within Donald Trump's own party have questioned his readiness for office.
It's Trump's comments on topics such as nuclear weapons, Russia, and the middle east that's got the political establishment so worried.
Here's a sample of the questionable foreign policy statements made by Donald Trump:
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SUPER: DONALD TRUMP, REPUBLICAN NOMINEE
"When people like me, I like them. Even Putin, you know, Putin! They want me to disavow Putin."
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"I call President Obama and Hillary Clinton the founders of Isis. They're the founders."
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"Now I didn't say anything about letting Japan nuke. But I did say 'perhaps if we can't do the right deal they one way might have to take care of themselves.' And if that means they need to get nuclear weapons…"
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It's statements like these which prompted
fifty former Republican national security advisers to sign signed a letter criticising Donald Trump's presidential bid.
In it they say Donald Trump would pose a threat to national security if elected president, and he'd be the most reckless commander in chief in US history."
Eric Edelman served as U.S. Ambassador to Turkey and Finland, and was a top advisor in the George W. Bush administration.
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"He seems to fundamentally lack an understanding of nuclear deterrents. These weapons exist essentially to preclude other countries from using it. Now it's true that that means that the credibility of our willingness to use them is important, but he seems not to understand that as well."
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Donald Trump has said he is his own best advisor
and these Republican advisers from former administrations
are exactly the people who
helped create the threats the United States now faces today.
He's also had his first intelligence briefing,
issuing a statement repeating the goals of improving immigration screening and standards to keep out radicals,
for starters on how to stamp out the Islamic State.
But Republicans who have been national security insiders are not convinced that Trump is listening
That's one reason why Ambassador Eric Edelman is worried about America's treaty obligations, for starters
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A guarantee that says, if they are attacked, by a hostile power, an attack on them is like an attack on teh United States and would elicit a response from the United States. Mr Trump says, he wouldn't necessarily make good on those committments, he would consider whether the ally have been living up to their side of the bargain. This is profoundly unsettling.
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Following the recent shakeup in Donald Trump's campaign staff,
the expectation is that the Republican nominee will focus more on his nationalist message,
make America great again,
a slogan which doesn't fit the globalized reality of the 21st century.
Priscilla Huff, Washington.
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