The legal battles before Donald Trump are expansive and varied. The former president is under investigation for everything from his handling of top secret documents to the price tag placed on his New York penthouse, and facing numerous lawsuits as well. But four high-profile investigations could have the biggest impact on Mr Trump - personally and politically. All are ongoing and have not resulted in criminal charges. What's being investigated? The Department of Justice is looking into the removal of government documents from the White House, which were then taken to Mr Trump's Florida estate, Mar-a-Lago, after he left office. Investigators are assessing how these documents were stored and who may have had access to them.The former president's sprawling beachside property was searched in August and 11,000 documents were seized including around 100 marked as classified. Some of these were labelled top secret. Unsurprisingly, we know very little about what's in the documents at this stage. But classified material usually contains information that officials feel could damage national security if made public. What has Trump said? He's denied wrongdoing and criticised the justice department's investigation, branding it "politically motivated" and a "witch-hunt". He has offered shifting defences which have mostly hinged on the argument that he declassified the material. No evidence has yet been provided that this is true. The former president has also argued that some of the documents are protected by "privilege" - a legal concept that would prevent them from being used in future proceedings. An independent lawyer is reviewing the seized material to determine if this is the case and that process continues. But Mr Trump has not directly addressed the key question of why the documents were at Mar-a-Lago in the first place. So how serious is it? This is an active criminal investigation and could result in charges being filed. Among other statutes, the justice department believes Mr Trump may have violated the Espionage Act by keeping national security information that "could be used to the injury of the United States". And as well as charges relating to the classified documents themselves, prosecutors are also looking at obstruction of justice as another potential crime. Mr Trump's team are now locked in a legal battle with the justice department over the investigation. What's being investigated? Prosecutors in New York are examining the Trump Organization, the former president's family company. There are two investigations in New York - one civil and the other criminal. Letitia James, the New York attorney general, is leading the civil investigation (which cannot result in criminal charges) and has spent almost three years looking at whether the company committed various acts of fraud over several decades in the state. These include allegedly overstating the value of real estate, such as golf courses and hotels, in order to get more favourable loans and better tax rates. The years-long criminal investigation, meanwhile, is being led by the Manhattan District Attorney Alvin Bragg, and is looking into the same issue as they relate to operations in New York City. What has Trump said? The former president and his lawyers have insisted the company did not operate illegally. He's accused Ms James, a Democrat, of pursuing a political vendetta, citing remarks she made before she was elected attorney general in which she vowed to sue him and branded him an "illegitimate president". Mr Trump, when called for an interview in the civil investigation, refused to answer questions and only confirmed his name. So how serious is it? Ms James filed a fraud lawsuit in September that it could - in theory - lead to the Trump Organization ceasing to exist in its current form. Ms James said the former president, his three eldest children and two company executives committed numerous acts of fraud between 2011 and 2021. The lawsuit alleges that the family inflated their net worth by billions, and is seeking $250m (£226m) that was allegedly obtained through fraudulent means. It's also seeking various penalties, such as bans on Mr Trump and his children from serving in a leadership role in any New York business. The criminal investigation has been quieter so far. Ms James, however, has referred her findings to federal prosecutors which could lead to a new criminal investigation being opened.