This is bad and the Trump administration should have pulled all strings to prevent it. Such investigations NEVER stick to their original, limited tasks but extend further and further. The order the Acting Attorney General wrote includes language which allows for nearly unlimited digging in "any matters that arose or may arise directly from the investigation.” It will thereby continue until -inevitably- some dirt will be found that can be blown out of all proportion and lead to prosecutions or impeachment.And he concludes with this ominous statement:
Trump believes that better relations with Russia are important for the well-being of the United States, Pence would likely pursue an anti-Russian policy.
That, I believe, is the real issue here. There are no unbeseeming relations between Trump and Russia. Russia had little, if any, influence on the 2016 election. There was no "Russian meddling". But Trump's somewhat more friendly behavior towards Russia, which he campaigned for, is disliked by the-powers-that-are.
We can now expect a very long drawn special council investigation with lots of media leaks and reporting. It will drown out all other important issues. It will likely end badly for Trump and badly for peaceful global power relations.