Over the last several days, Trump has been part of an escalating feud with fellow Republican Jeb Bush. Trump most recently drew criticism for saying that the former Florida governor should “set the example by speaking English while in the United States.” He doubled down on those comments in response to a question at his press conference today, saying \"I think when you get right down to it, we are a nation that speaks English, and I think while we are in this nation we be speaking English.\"

Still, a new national Monmouth University poll out Thursday shows Trump garnering 30 percent of Republican voters, his highest support in a national poll yet this cycle. Neurosurgeon Ben Carson had 18 percent support, while Bush and Texas Sen. Ted Cruz tied with 8 percent.

ABC News has confirmed that roughly half the Republican field has already signed or plans to sign the RNC’s pledge.

Get real-time updates as this story unfolds. To start, just \"star\" this story in ABC News' phone app. Download ABC News for iPhone here or ABC News for Android here.

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