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(CNN)Today, I admire Donald Trump. His remarks made in the aftermath of the terror attack in Manchester captured the mood in Britain perfectly. Terrorists are not soldiers, not even murderers -- they are "losers." And this tragic event validates Trump's initiative of uniting the world against terrorism. Suddenly, he feels like a serious international leader.

Trump to Meet the Pope at Vatican 06:40

That's why Trump's appearance at the Western Wall in Jerusalem was important too -- and quite emotional. Trump has made a commitment to Israel that clears up any doubt left by Obama. Critics will sniff that this shows his own lack of imagination, or the influence of neoconservatives.

But what is the alternative? To isolate the only properly functioning democracy in the region -- a friend to the West struggling to survive against the odds?

Moreover, Israel's experience and intelligence is critical to the defeat of ihadist terrorism. Which brings us to the final strand of Trump's Middle East tour.

Trump on ISIS: Obliterate this evil ideology 01:07

The greatest fear I had of Trump's foreign policy was that he might bleed popular American dislike of Islam into an all-out conflict with it. But, as he observed in his speech, the greatest victims of Muslim violence are Muslims -- so there are plenty of Muslims for America to ally with.

Trump's warmest reception has been among Muslims and Jews. He may find the Christians are a harder audience. When he visits Pope Francis on Wednesday, he meets a seasoned diplomat with his own sense of strategic priorities: tackle global warming, compel Europeans to take more refugees, defend Christian's overseas.

Yet any tensions between Francis and Trump will surely be overshadowed by the terror attack in Manchester. Israelis and Saudis speak bluntly about the threat posed to civilization by radical jihadists; Europeans retreat behind platitudes. It's good for all three to be rallied by a president who wants to emphasize what everyone has in common, which is a vulnerability to terror.

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On tour abroad, Trump does what Obama should have