India, May 20 -- In a stunning political manoeuvre, two of the United States' most powerful kingmakers have officially broken their silence to upend highly competitive primary races. US' former House Speaker Nancy Pelosi and US President Donald Trump have delivered critical late-stage endorsements in California and Texas, potentially reshaping the future of both the Democratic and Republican parties.

Pelosi stepped into the spotlight on Monday to endorse San Francisco Supervisor Connie Chan as her preferred successor for California's 11th Congressional District, a seat Pelosi has held for nearly 40 years.

Less than 24 hours later, Trump countered with his own political bombshell on Tuesday, backing Texas Attorney General Ken Paxton in a...