Ted Cruz has said he is voting for Donald Trump for president - a shock about-face after he rocked the Republican convention by dramatically refusing to do so.
The Texas senator said on Facebook that he made the decision for two reasons. First, his promise to support the Republican nominee.
And second, his belief that Democrat Hillary Clinton is "wholly unacceptable".
The reverse was stunning since the Texan was booed lustily during a floor speech at his party's convention for urging Republicans to "vote your conscience" without naming Mr Trump.
To see this post on Facebook, click here.
Mr Cruz finished second to Mr Trump in a bitter primary and for months baulked in offering support, despite his previous pledge to endorse the eventual Republican nominee.
Polls have since suggested that Mr Cruz's popularity was slipping nationally and back home in Texas, where he could face a primary challenger for re-election in 2018.