Irish PM cites Trump's backing for US role in united Ireland push.
Context
What happened: Irish PM Micheál Martin said the US could potentially play a role in a future push for a united Ireland, after President Donald Trump backed reunification during a recent visit to Ireland.
Key numbers: Good Friday Agreement signed in 1998.
Why it matters: Martin said reconciliation between nationalist and unionist communities must come first, and that more work is needed to define what a united Ireland would look like. A recent Garvaghy Road parade standoff underscored remaining divisions.