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Donald Trump Jr. hints that he'll campaign against Justin Amash

Donald Trump Jr. effectively confirmed that he will campaign against Rep. Justin Amash, the first Republican to advocate for impeaching President Trump, in a Thursday tweet, saying that he hears "Michigan is beautiful during primary season."

Why it matters: Trump Jr. is the Trump family member with the largest following among the Republican base — and a powerful social media presence. Amash responded to Trump Jr.'s threat by tweeting: "if it's what you say I love it especially later in the summer" — a reference to the email Trump Jr. sent in 2016 after being offered dirt on Hillary Clinton by the Russian government.

Go deeper: Trump seeking candidates to primary Republican Justin Amash