As he touched down at the G-7 summit in the French resort town of Biarritz, Johnson was preparing for what will be a closely watched first meeting with the USA president.
"What we'll make of this is whether Boris Johnson manages to be a different person on the world stage than he managed as foreign secretary - because he was a disappointment", Bronwen Maddox, director of the Institute for Government think-tank, told AFP.
British Prime Minister Boris Johnson spoke to US President Donald Trump on the phone ahead of their one-on-one talks on Sunday on the sidelines of the G7 Summit in France.
In his remarks, he insisted that the United Kingdom would be an "energetic partner" on the world stage after Brexit.
Trump says he is eager to meet Johnson, a fellow maverick who enjoys his approval.
The two spoke on Friday ahead of the meeting of world leaders in the French resort of Biarritz, where they are expected to talk up the prospect of a bilateral trade deal once Britain leaves the European Union.
Hong Kong protesters throng streets in heat and heavy rain
Another weekend of protests is underway in Hong Kong, with teachers rallying to support students and other protesters. Police had not approved a march on Sunday.
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Clashes return to Hong Kong protests
He adds that he's not against democracy in Hong Kong or the region as a distinct territory. "We will explain more later". Tear gas continued to be used with up to 10 canisters shot at a time, and some protesters began throwing it back.
They are both divisive figures in their respective countries and enjoy provoking their opponents.
"I want to see an opening up of global trade, I want to see a dialing down of tensions and I want to see tariffs come off". "Such a scenario would create market risk for investors, given they seem to be presently short in sterling as a way to hedge their Brexit risk".
Britain is due to quit the bloc on October 31, regardless of whether Johnson manages to secure an exit deal with Brussels.
"If a deal were to be agreed outside of normal trading hours at a time of day when there tends not to be a lot of liquidity in the market, sterling would reprice higher", said Richard Oliver, head of cash currency trading for EMEA at HSBC Holdings Plc.
"If Johnson pulls off a deal - which now nearly nobody is expecting, it isn't even our base case - that will really be a strong bull case for sterling", said Daniel Trum, a strategist at UBS Global Wealth Management.
Johnson "faces a dilemma", said Charles Grant, director of the Centre for European Reform think-tank.