A nationwide poll puts support for the anti-immigrant Alternative for Germany party at 16 percent, up 2 percentage points to its highest level yet.

The nationalist party is benefiting from voters' unhappiness about the arrival of more than a million asylum seekers since early last year.

The survey, published Friday by public broadcaster ARD, puts support for Chancellor Angela Merkel's Christian Democrats at 32 percent, down 1 point. The Social Democrats were down a point at 22 percent.

Merkel's chief of staff, Peter Altmaier, told ARD that her party's support would likely improve once citizens "see and feel that we've got a grip on these problems."

The poll by Infratest dimap questioned 934 voters between Sept. 19 and 21. Its margin of error was plus or minus 3.1 percentage points.