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Here's what two former US ambassadors say Trump needs for his upcoming foreign trip

Pauline Chiou
Jack Guez | AFP | Getty Images. "Foreign policy and national security is not something you can just wing," said one former U.S. ambassador.

President Donald Trump embarks on his first foreign trip this week. First stop: Saudi Arabia . Second stop: Israel . Then it's on to the Vatican to meet the Pope, the NATO Summit in Brussels and G7 in Italy .

The trip is intended to bolster Trump's standing on the world stage, but his divulging previously classified information obtained by Israel to adversary Russia and the questions swirling about former FBI Director James Comey and former National Security Advisor Michael Flynn may create setbacks on that front.

Two former U.S. ambassadors spoke with CNBC about Trump's standing among foreign leaders and what he needs to do to win credibility. Here are parts of the conversations:

Daniel Shapiro, former U.S. ambassador to Israel under President Barack Obama (2011-2017) and current senior fellow at the Institute for National Security Studies in Tel Aviv

CNBC: President Trump is going to be meeting with Prime Minister Benjamin Netanyahu this week. How do you think the Israelis are discussing this ?

Shapiro: I expect, in private, the PM will have to have some very frank conversations with the president to explain to him the damage that's been done. And to confirm that there will be procedures put in place and that the president's own personal discipline will be such that this won't be repeated.

CNBC: What does Trump need to do to shore up his credibility ahead of this trip?

Shapiro: I think he needs to show more discipline. I think he needs to spend time with his experts and really master the details and the briefings that he receives...and read through all that material. Foreign policy and national security is not something you can just wing. I think he's going to have to demonstrate a different kind of rigor and discipline than he has shown so far to win the confidence of many of the foreign leaders he deals with.

CNBC: Do you think he's capable of that kind of discipline?

Shapiro: I'm not sure. You know, he's 70 years old. He's obviously conducting his affairs in government in a similar way that he has conducted his business affairs throughout his adult life. It's difficult for a person to change at that stage of life but I think it's imperative for our country, for his success that he try and do so.

CNBC: What are your colleagues and contacts in Israel saying about all of this?

Shapiro: People are trying to be polite. Everybody cares about this relationship. Everybody wants to see the United States succeed and the U.S.-Israel relationship continue to be as strong as it's been over the last number of years.

But there is a recognition that we're dealing with something unusual and maybe unprecedented in American history — a president who is as unpredictable and inexperienced as this one and potentially compromised in serious ways. And that has Israelis — who depend so much on the United States for their own security — very nervous.

Frank Lavin, former U.S. ambassador to Singapore under President George W. Bush (2001-2005) and current CEO for Export Now

CNBC: How does Trump gain credibility ahead of his first foreign trip?

Lavin: Any U.S. president begins with a fair amount of credibility because this is his first foreign trip and because he holds the office. His power, I think, stems not so much from personal charm or charisma, but from the power of the office he holds ... That's a baseline factor. Regardless of who he is, it's still the United States. He's still president of the United States. "

CNBC: If you're Saudi Arabia or Israel and you hear about Trump spilling secrets to Russia, aren't you going to ask yourself, "How do we trust this person?"

Lavin: Each of them has such overriding security issues that they say, "This is a fact of life." Each of them, primarily because of Iran, has a pretty good working relationship with the [Trump] administration. Saudi Arabia and Israel are enormously concerned about Iran.

There's this old saying from the Canadian Foreign Ministry: America is our best friend whether we like them or not. It's just a practical view of reality. I think that's what Saudis and Israelis would say: America is our best friend whether we like them or not.

CNBC: The Kingdom of Saudi Arabia has invited leaders from other Gulf countries. How should Trump approach the whole Muslim ban issue?

Lavin: This is his first trip to a Muslim country. It's reasonable to ask him to explain himself. I think the Saudi King is too dignified and the Saudi King won't do it. But it behooves the president to give some kind of reference to his earlier statement on his views of Muslim countries ... If I were advising the president, [I'd say] you need to speak to this issue before it comes up because it's a reasonable question.

They might ask it. The media might ask it. Someone is going to say, "How can you be this champion last year of banning Muslim visitors and now you're visiting Muslim countries?" I think he needs to have some kind of response to this point.

CNBC: If you were advising Trump, what would you tell him?

Lavin: My advice to the president would be to say you've got a core message in each country you're visiting. It might have two to three elements to it. You're there to define U.S. policy toward that country and establish a personal rapport with leadership ... You've got to find a way to connect with local leaders so there is respect ... You need to have a public posture that allows the general population to find you worthy of friendship.



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