Generate an appropriate single-sentence summary for the given text such that it includes the main topic of the text.

Let me give you an example: By Marianna SpringSpecialist disinformation reporter, BBC News The adverts show the Democratic Party challenger with an earpiece, and say that he refused to have his ears checked for devices prior to the debate. The Biden campaign rejected the claims. The Trump campaign adverts ask: "Why won't Sleepy Joe commit to an ear test?" and "Who is in Joe's ear?" Accusations that presidential candidates have received debate help via hidden hearing devices are familiar, albeit unproven. Such allegations have been levelled against both Republican and Democratic candidates in the past. Prior to Tuesday's debate, the rumour about Mr Biden's supposed earpiece was circulating on several social networks, and was being promoted by the Trump campaign. At least 15 versions The advertising campaign was launched after the debate, and also promotes two other baseless but widely shared rumours about Mr Biden. One suggested he asked for breaks during the debate, and another accused him of refusing a "drug test". The photo featured in the advert is not from Tuesday's debate. It was first shared online in September 2019. In a number of the adverts, it has been doctored to show Mr Biden wearing wireless Apple headphones. This was not the case in the original image. Some versions circle the ear featuring the headphone. By Wednesday evening, there were at least 15 different versions of the advert, and according to Facebook's Ad Library, they had reached at least 10 million users. Facebook has pledged to label posts containing voting misinformation and point users towards accurate information ahead of the election. However its policy does not involve fact-checking political speech, including in advertisements. The company declined to comment about the latest Trump ad campaign. Rumour origins Hours before the debate, the claims went viral on Facebook and YouTube. Identical memes were pushed by a number of popular Facebook pages with names such as US Conservative and Unhinged Left. They claimed "Joe Biden should be inspected for a hidden earpiece as well as submit to a drug test before the debate". These memes are subject to fact-checks - and some have had warning labels applied to them on Facebook. The claims were picked up by Fox News and other conservative news outlets. They were further amplified by supporters of QAnon, an unfounded a conspiracy theory that claims President Trump is fighting a secret war against elite Satan-worshipping paedophiles. Those who believe in QAnon are known for promoting political disinformation on social media which targets opponents of the president. They shared close-up pictures of Mr Biden's ears, alleging a listening device was visible. During the debate, some also shared photos of a fold in Mr Biden's shirt, claiming it was caused by a wire, and of a supposed device on his wrist, where he wears a rosary in memory of his late son Beau. Nothing new Conspiracy theories about secret listening devices have been recycled in presidential election campaigns for the past two decades. Democratic candidate Hillary Clinton faced similar unfounded claims ahead of the 2016 presidential election. In 2004, rumours circulated among left-wing sites and blogs that President George W Bush was being aided by a secret earpiece. None of those allegations were found to be true. Even if a candidate did wear an earpiece, any advantage would be questionable. As TV and radio presenters can attest, listening to someone while simultaneously talking during the back-and-forth of a live event is a difficult skill to master.
The answer to this example can be: US President Donald Trump's re-election campaign is running hundreds of Facebook advertisements pushing an unfounded conspiracy theory that Joe Biden cheated during the first US presidential debate.
Here is why: This is a relevant summary for the given paragraph. It also contains explicit phrases from the given text

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The Lib Dem leader suggested both he and his Labour counterpart Ed Miliband backed having three debates over consecutive weeks before polling day. This was a "success" in 2010 and the "public liked them", he said. The Conservative leader has suggested staging debates over a longer period, not just during the five-week campaign. He has suggested that such a quick sequence of debates in 2010 took up too much media attention and took some of the gloss off the rest of the campaign. But speaking at his monthly press conference, Mr Clegg - widely regarded to have performed well in 2010 - said they were a step forward and should be repeated. Labour MP Lucy Powell, who is close to party leader Ed Miliband, said the party leaders needed "to get round a table and resolve the issue". Speaking on the BBC's Daily Politics, she suggested Mr Cameron was a "lot less keen" on the idea than he had been in 2010. And UKIP leader Nigel Farage has repeated calls for him to be included in the debates - saying "politics has gone through a big change" since 2010. He told the BBC that UKIP had leapfrogged the Lib Dems in some opinion polls and the public wanted a "bigger debate in politics". Excluding him from the debate would give his party "underdog status", he added. Mr Cameron told the BBC in September he wanted the debates to take place again but said "I think we could start them a bit earlier... now we've got a fixed-term parliament we can stretch these things out a bit". He also said it should be "predominantly" about people who have a chance of being PM, a category which he said did not include Mr Farage.
Answer:
Nick Clegg has urged David Cameron "to sign on the dotted line" for a repeat of the format of the 2010 general election debates.