The REAL motivation is they obviously want that loose canon lunatic traitor Justin Amash back in power, and the ONLY way he can slip in is if enough GOP voters are uninformed about what a wackjob he is. When Trump and other high profile candidates talk about the candidates, primary voters will realize Amash is to LEFT of Rogers, which would kill his chances of making it thru a GOP primary. So they Trump and others to STFU so Amash can sell his "I'm the TRUE constitutional conservative candidate, Rogers is RINO scum" talking point to gullible GOP primary voters, and not have any high profile Republicans inform voters otherwise.
No matter how much they yell otherwise, they are obviously NOT "concerned" about Rogers being disloyal to Trump, otherwise they wouldn't touch Amash (who is 10X worse than Rogers and was openly considered for "service" as a "House Manager" of the Trump impeachment trial in the Senate to prosecute Trump for his "crimes") with a 10ft. pole. Crying about Rogers backstabbing Trump -- while ignoring Amash's treason -- is laughable.
Even putting aside Amash's insane level of Trump-hate, if you just look at his voting record on legislation, he is in no way the "more conservative" candidate in the primary, and routinely was the "lone Republican" in Congress to vote with "the Squad" on various bills. Amash is only a "true conservative" if your idea of "conservative" is voting for open borders, celebrating the "LGBTQ community", allow unrestricted abortion on demand, condemning Israel and refusing to lift a finger against Hamas, etc., etc.
Rogers has his flaws, but his voting record is actually pretty conservative, and he is not nearly as bad a "RINO" as the Paulbots pretend he is. Even if he was the actual RINO they pretend he is, he'd STILL be better than Amash, if no other reason we won't have a pro-Palestinian Hamas sympathizer and fanatical Trump-hater on "our side" in the U.S. Senate. That kinda stuff makes real RINO scumbag like Susan Collins look decent in comparison.
Complaining about Trump's bad endorsements IS a legitimate topic, and NO ONE has been more outspoken about Trump's crappy endorsements in the past than me (I was against it LONG before it was cool, I was vehemently against Rex Tillerson from SOS when a bunch of FReepers wanted to rubber stamp his appointment, for example). I'm not against Trump's "bad endorsements" here, because Trump has to deal with the cards he was dealt. Endorsing Rogers over Amash is not "bad", anymore than Winston Churchill teaming up with Stalin to take out Hitler was.
Not helpful at al, because he may sway someone who is on the fence to not vote for Trump.
We know Trump is willing to not only stand up to the Deep State, but to work to defeat them as well. I can't be as certain about Rand Paul doing what Trump has started & is continuing the battle.