The phrase "unwelcome distraction" refers to something that takes away your attention or focus and is not wanted or appreciated. It is an interruption or disturbance that troubles or bothers you. Full definition
The cases of both MPs suspended by the SNP - now sitting in the commons as independents - promise to become unwelcome distractions for the First Minister next year. (totalpolitics.com)
A poorly timed reshuffle can come as a particularly unwelcome distraction to forming critical relationships in parliament, or even to just getting on with the business of governing in general. (totalpolitics.com)
Regardless of the outcome, the investigation is unquestionably an unwelcome distraction for an administration that has struggled to move past questions about ties to Russia. (fortune.com)