Theresa May, the British prime minister, said on Tuesday that she will call for a general election on June 8.

She said she decided to call for snap polls reluctantly but felt she had no choice. In recent weeks, May and her office have keep saying that there would be no election until 2020.

The ruling party has a majority of 17 in the current Parliament, which leaves May vulnerable to rebellions from her own party members, either those who are against Brexit or those for it.