About 2 weeks before the election, James Comey, the director of the FBI announced he was reopening the investigation into Hillary Clinton's unauthorized email server. They had found a cache of Clinton's emails on the laptop of her aide Huma Abedin's husband, Anthony Weiner, who was himself under investigation for sexting an underage girl. Comey announced this even though they had no idea whether there was anything incriminating in those Clinton emails or whether those emails had been already been found and analyzed before. Then about a week later, Comey announced that it was much ado about nothing, and there was nothing new in those Clinton emails.
It was widely speculated at the time that Comey had been pushed into reopening his investigation by a faction of agents who had a serious thing against Clinton. They'd spent years investigating her but never quite managed to catch her doing something illegal. Many of them supported Trump (unsurprising; law enforcement leans Republican). To tamp down the internal rebellion, Comey had to prove that he wasn't protecting Clinton.
Now less than a month after Trump wins, the FBI is leaking furiously to undermine Trump's administration. Did they switch sides, or are their dueling factions in the FBI? Why did the anti-Trump leakers wait so long? Surely they knew about Trump's Russia contacts beforehand.
I mean if the republican party establishment were organized, they could have presented Trump with a team of their advisers, and dealed with the adventurers by bribing them away, giving them impressive sounding positions, where they wield little actual powers, divide them out in comitees, where they'd then be a single voice in their comitee, or simply thrown them out, if there was an opportunity.
There's the difference between an American political party and a European one. In parliamentary systems, parties are much more organized and disciplined. The Prime Ministerial candidate is chosen internally by the party, and they can keep him or her in line. If the Prime Minister loses the support of his or her own party, they can hold a vote of no confidence and boot him or her out.
American political parties don't do that. They're at the mercy of their primary voters ("the base"), and they basically turn into vehicles for whoever ends up being the presidential candidate. Nobody else has the standing to dictate the members of his administration to him. They can make suggestions, but not force him.
Trump did end up taking some relatively sane people into his administration on the advice of senior Republican figues, but pretty much all presidents reserve some positions for their closest and most trusted campaign advisers. Trump's campaign advisers are complete nutters.