His lawyer said Kushner will cooperate with investigators.
Trump vowed a thorough review of leaks from his administration after a British official said Thursday that Manchester police have decided not to share further information on the bombing investigation due to leaks blamed on USA officials.
Trump said the US would not "forsake the friends" who came to America's aid after the deadly terrorist attacks.
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Trump then straightens his jacket and has a brief conversation with Lithuanian President Dalia Grybauskaite.
Data from Germany's Federal Statistics Office on Monday showed that exports to the United States jumped eight percent on the year in the first quarter, to almost 14 billion euros, signaling that trade is flourishing despite President Trump's protectionist rhetoric.
"We remember and mourn those almost 3,000 innocent people who were brutally murdered by terrorists on September 11, 2001", Trump said.
Last year, Trump threatened to abandon US allies in Europe if they did not spend enough on defense, comments that were particularly unnerving for the ex-Soviet Baltic states on Russia's border which fear Moscow might try a repeat of its 2014 annexation of Ukraine's Crimea.
"We have to be able to increase defense spending when tensions are going up".
"We're happy that in the future the sole question will no longer be how much we spend on defense but also what contributions are being made to North Atlantic Treaty Organisation in terms of capabilities and contributions we're offering", Ms Merkel told reporters as she arrived for the meeting.
The defense alliance is expected to give the US president at least one big thing he wants, a commitment to the coalition to fight Islamic State. The US president has been very clear on his commitment to Nato's collective defense clause, but also "on his expectations", he said. National Security Adviser H.R. McMaster, who appeared with Cohn at a briefing late Friday, quickly jumped in to reiterate that Trump would make a decision based "on what's best for the American people".
Because of President Trump's past praise of Russia's President Vladimir Putin, and his tough talk on migrants and minorities, protesters were out in mass when he arrived in Brussels. Trump said on Twitter after the meeting he is "more determined than ever to pursue PEACE in our world". The world leaders were later joined by other high ranking European Union members. While speaking to dozens of Muslim leaders in Riyadh, Saudi Arabia, he called for Muslim unity in the fight against terrorism.
After a relatively successful first half of his big trip overseas, in that it wasn't a total disaster, Donald Trump landed in Brussels on Thursday, where he apparently felt comfortable enough to act like his old self again.