So is Donald Trump’s entire career now under criminal investigation?

Who investigates the investigators?

Bloomberg reports that special counsel Robert Mueller expanded his investigation into Russian interference in the 2016 presidential election to include “examining a broad range of transactions involving [Donald] Trump’s businesses as well as his associates.” The transactions not only involve “associates” but, in some cases, date back a decade. The deals include Russians buying apartments in Trump-owned buildings and the sale of pricey Florida real estate to a rich Russian in 2008.
Why not also subpoena disgruntled former USFL players angry at the Donald’s role in the league’s demise to testify?
Mueller’s initial purpose, examining allegations of the Trump campaign’s collusion with the Russian government to influence the 2016 presidential election, now yields to a wider probe into the president’s business practices dating back a decade.

In a glass-half-empty interpretation, a special counsel unbound by external constraints who takes too much stock in the word “special” and not enough counsel certainly means more headaches for the president. The glass-half-full take interprets the broadening investigation as a tacit admission that Mueller found no evidence of collusion.
One with a plate overflowing with herring does not embark on a fishing expedition.

https://spectator.org/special-counsel-reaches-down-russian-rabbit-holes/