re: What was Muller investigating?

Is Special Prosecutor Devin Nunes writing to AG Scott Pruitt you're talking about?

And of course.

Oh, by the way, did you see the Times story yesterday about the Trump tried to fire Mueller again in December after the story came out about subpoenas to Deutschebank?

quote:

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In early December, President Trump, furious over news reports about a new round of subpoenas from the office of the special counsel, Robert S. Mueller III, told advisers in no uncertain terms that Mr. Mueller’s investigation had to be shut down.

The president’s anger was fueled by reports that the subpoenas were for obtaining information about his business dealings with Deutsche Bank, according to interviews with eight White House officials, people close to the president and others familiar with the episode. To Mr. Trump, the subpoenas suggested that Mr. Mueller had expanded the investigation in a way that crossed the “red line” he had set last year in an interview with The New York Times.

In the hours that followed Mr. Trump’s initial anger over the Deutsche Bank reports, his lawyers and advisers worked quickly to learn about the subpoenas, and ultimately were told by Mr. Mueller’s office that the reports were not accurate, leading the president to back down.

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Trump Sought to Fire Mueller in December