Several more challengers this week have jumped into the Republican race to try to thwart former President Donald Trump from capturing the party's presidential nomination for a third consecutive time.
There is former New Jersey Governor Chris Christie, a Trump rival-turned-ally turned foe again. A current governor, billionaire Doug Burgum of North Dakota, also has launched his campaign. And on Wednesday, Trump's longtime loyal vice president, Mike Pence, announced an unprecedented quest to defeat his former boss. He wasted no time denouncing Trump in a manner he had assiduously avoided.