Hardly. He's under siege because he wouldn't do Trump's dirty work.
What dirty work is Trump asking him to do?
Going after the Clintons is not dirty work. There is plenty of evidence that while Hillary was Sect. of State she sold the office for contributions to their foundation, or speaking fees to bill.
Would it have been dirty work for AG Sessions to not recuse himself until there was actual evidence of a crime involving Russia and the election?
Pres. Trump may not be our first choice for POTUS, but he should be treated fairly. Anyone paying attention can see the Russia collusion stuff is a setup.