Jeremy Corbyn, leader of the U.K.'s opposition Labour Party, asked rival parties to support him as prime minister in a coalition to block Boris Johnson's government from pursuing a "no-deal" Brexit.

Corbyn wrote to other political parties' leaders and rebels in the Conservative Party Wednesday, seeking support in a vote of no confidence in the government. He said that if that was successful, they should make him caretaker prime minister so he could delay Brexit and call a general election. Corbyn's overture was welcomed by the Scottish National Party, but rejected by the Liberal Democrats and the Welsh nationalists of Plaid Cymru.

Johnson has said he's committed to delivering Brexit "do or die" on Oct. 31, without an agreement if necessary — a scenario economists say would harm the economy. Members of Parliament seeking to prevent it have floated plans including replacing Johnson's government with a cross-party "government of national unity" to seek a Brexit delay.