Donald Trump is well known to speak about controversial topics without having any facts behind him. Donald will happily mingle with dodgy people, this means the fact one of his entourage has been making business propositions unsurprising. To save face in such a situation shaking things up to please the press and take heat off can be a good political strategy. The revelation is highly likely to have played a part in the campaign shake-up.
The many headlines about Paul Manafort, Trump's former campaign manager, brought too much negative attention to Trump's admiration of Putin. To change the subject, the Trump campaign made Kellyanne Conway the new campaign manager and brought in Stephen K. Bannon, a right-wing website firebrand. Unfortunately for Trump, it is not working and attention is still on Paul Manafort's Ukraine consulting work.
I think Trump may have business ties to Russia and now that they are coming out into the open he is trying to remove the people who might implicate him. I'm surprised his Russian ties haven't been investigated by the media earlier. It seems ironic that in a bid to avoid big American money in politics, the American people have chosen a person backed by big Russian money.
The recent shake-up of Donald Trump's campaign leaders was a move to displace Paul Manafort. Manafort was tied to his role in foreign lobbying in Ukraine. Manafort had financial dealings in that country that reflect poorly on Donald Trump's association with him. The new campaign leaders are meant to take the spotlight off of Manafort.