Next year’s polls will “not be a walk in the park” as Germany is deeply polarised, noted the German leader, but urged the population to remain “sceptical about easy answers”.

“Rarely is it the easy answers that bring progress to our country,” she said, in a clear reference to the upstart anti-Islam and populist AfD, which Merkel had previously criticised as offering no solutions to problems.

Merkel, who has led Germany for 11 years, last month confirmed she would run for a fourth term but acknowledged that the election would be “more difficult” than any other she has contested.

Tackling the hot potato issue head-on, Merkel vowed that “a situation like that of summer 2015 can and must not repeat itself”. She also stressed that each asylum request would be examined carefully, and “not all can and will stay” in Germany.

Party faithful will deliver their verdict on her stance when they are asked to re-elect her later Tuesday as party chief. While there is no question that she will win the vote, the ballot will be closely scrutinised for any sign of dissent.

During the last party vote in 2014, Merkel garnered 96.7 per cent of support and national media suggested that any score below 90 per cent would be a slap in the face.

Merkel’s CDU and its Bavarian sister party CSU secured a decisive win of 41.5 per cent at the last election in 2013 – its best result since national reunification in 1990, on the back of strong approval for her tough stance on austerity for debt-stricken EU nations.

Three years on, there are rumblings of discontent – even within her own party – following her September 2015 decision to let in refugees fleeing war in mostly-Muslim nations, a move that deeply polarised Europe’s biggest economy.

Although Merkel has since moved to slow the influx, including through a highly controversial deal with Turkey, the AfD has gained a firm footing as a protest platform for disgruntled voters.

The party now enjoys around 12 per cent support, while at the last general election it fell short of the 5 per cent threshold to ensure representation.

Hitting out directly at the populists as well as the xenophobic PEGIDA movement, she wrestled their “we are the people” rallying cry back, declaring to sustained applause: “We all get to determine who ‘the people’ are – not just a few, no matter how loud they are.”

Beyond domestic issues, Merkel also devoted a large part of her address to crises abroad as she noted that in 2016, “the world has not become stronger and more stable, but weaker and more unstable”.

She deplored the failure of the international community to alleviate the suffering in Syria’s besieged city of Aleppo, calling it a “disgrace”.

Merkel said she was shocked to see tens of thousands of Germans hitting the streets to demonstrate against free trade deals but virtually no protests against the blood-letting in Syria.

“There is something wrong there,” she said.

She also underlined the importance of holding the European Union together, saying Germany will do well “only when Europe does well too.”

In the face of the mountain of challenges, Merkel urged her delegates: “You must, you must, help me.”