New Delhi, July 10 -- LONDON - Britain will have its sixth prime minister in seven years by July 20. On Thursday, Andy Burnham won 322 Labour MP nominations in the first round of the party's leadership contest, Euronews reported, falling one short of the 323 threshold that would mathematically prevent any remaining challenger from accumulating the 81 signatures required to qualify for the ballot. Nominations close on July 16. No rival has declared.

Armed Forces Minister Al Cairns withdrew Wednesday, saying "months of internal Labour politics isn't what the country needs right now." Former Health Minister Wes Streeting, once regarded as the centrist alternative, dropped his own bid and announced he would back Burnham. The Labour Party has...