Sen. Joe Lieberman (I-Conn.) may have softened his rhetoric toward the Obama administration after being welcomed back into the Democratic caucus, but he has not stopped being an occasional thorn in the president's side.

Lieberman announced Wednesday that the administration could be doing more to combat drug cartels, and, of all people, an old campaign trail ally -- Sen. John McCainJohn Sidney McCainThe Hill's Morning Report — Recession fears climb and markets dive — now what? Trump makes rare trip to Clinton state, hoping to win back New Hampshire Graham promises ObamaCare repeal if Trump, Republicans win in 2020 MORE (R-Ariz.) -- agreed.

"Lieberman just announced at the hearing that the administration could do more to combat the drug cartels," McCain tweeted. "I agree."

The administration announced its response to the ongoing drug war in Mexico yesterday morning.