Prime Minister Boris Johnson raised the prospect of a snap election after suffering a major parliamentary defeat on his first key Brexit vote.
Lawmakers - including 21 of Johnson's fellow Conservatives - voted 328 to 301 to seize control of the Brexit agenda.
This means they can bring forward a bill seeking to delay the UK's exit date.
In response, Johnson said he would seek action on that election bill Wednesday if he sees a second defeat.

Shooting at Australia's Bondi Beach kills 12
Police hold person of interest after Brown University shooting leaves two dead
Hamas says Israel's killing of senior commander threatens ceasefire
Ukraine's Zelenskyy ditches NATO ambition ahead of peace talks
Thailand declares curfew along coast as Cambodia border fighting spreads
India tightens pollution curbs as Delhi's air quality worsens
'Peace is not far away' says Erdogan after Putin meeting
Belarus frees Nobel winner, protest figures as US lifts more sanctions
