A White House spokesman said Michael White's release may lead to an opening in the otherwise deeply bitter relationship between Iran and the United States.
It was not immediately clear what information Trump was referring to in his tweet, which was posted after he was scheduled to have an intelligence briefing.
The Yemeni people cannot afford another setback to peace.
Pakistan's leadership is embroiled in institutional clashes, petty squabbling and political scandals. So who is steering the ship?
The accidental downing of a Ukrainian commercial flight has turned the political tide in Iran.
Powerful Shia cleric Muqtada al Sadr calls for peaceful "million-strong march" against US troops in Iraq, as new rocket attack targets US soldiers in Camp Taji air base north of Baghdad, Iraqi military says.
Qasem Soleimani's less charismatic replacement won't change Iran's regional policies, but we might witness an expansion.
The non-binding resolution was introduced by Democrats after Trump's order to kill an Iranian commander and retaliatory missile strikes by Iran dramatically escalated tensions between the two foes.
The assassination of the top Iranian general is simply the next stage in the creep of hybrid war, which sees Iran and the US battle for influence and each try to bend the other to its will.
"We're receiving some encouraging intelligence that Iran is sending messages to those very same militias not to move against American targets or civilians, and we hope that that message continues to echo," says US Vice President Mike Pence.
While Americans were expecting retaliation, Iran has upped the ante by firing ballistic missiles on Iraqi air bases, which house US troops.
Iran hits US air base in Iraq with ballistic missiles, marking a sharp surge in the US-Iran tensions.
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