| Clue | Source | Date |
|---|---|---|
| Doing that thing they do | ||
| Back to causing trouble | USA Today | 17 Aug 2022 |
| Back to being a nuisance | Wall Street Journal | 29 Sep 2021 |
| Back to making trouble | Eugene Sheffer | 28 Jun 2021 |
| Up to one's old tricks | New York Times | 14 Aug 2020 |
| Causing more trouble | Universal | 06 Jan 2019 |
| Causing more trouble | ||
| Like political foes, frequently | LA Times Daily | 15 May 2016 |
| Like political foes, frequently | ||
| Up to one's old tricks | ||
| Stirring up more trouble | ||
| Quarreling once more | ||
| Back to one's old tricks | ||
| Quarreling once more | ||
| Back to bickering | ||
| ". . . up to his old tricks" | ||
| Up to more mischief | ||
| Bickering once more |