The beauty pageant’s organisers say they discovered the “unacceptable” tweet after the ceremony.
The senator says he “cannot in good conscience” approve the plan, which is backed by President Trump.
A dam has failed and caused “extremely dangerous” flooding in hurricane-hit Puerto Rico.
About 10,000 people are evacuated amid fears an eruption on the Indonesian island could be imminent.
Protesters drown out a speech to university students in Washington by ex-FBI director James Comey.
The inspector general will focus on Mr Price’s private plane trips and “may encompass other issues”.
Entry to the Zeitz Mocaa in Cape Town is free at certain times for anyone with an African passport.
Professor wins praise on social media for bringing his mother, who has Alzheimer’s, to his lectures.