8 arrested in relation with Monday's explosion that killed 22.
Lucas Papademos, two others in stable condition after attack.
President Trump among 4 world leaders making their debut at economic summit Friday.
Series of bombings killed over 100 civilians.
President reissued his longstanding call for members to pay their fair share.
Called the attack at event attended by so many young people "wicked."
More suspects arrested as Britain raises terror threat level.
Transcript shows president praising a drug fight that's left thousands dead.
President Trump's U.N. envoy sets foot in the no-man's-land between country, Turkey.
Says meeting with pope was the 'honor of a lifetime.'