In this case, it seems that Marine Le Pen, the French political figure who has previously run for the French presidency, is potentially facing legal troubles that could hamper her next bid to lead the country. Prosecutors, or legal officials who represent the government in court cases, are reportedly seeking to have Le Pen banned from political activities.
The exact reasons for this attempt are not stated in your message, and would need additional information for clarification. However, it’s common in such cases for prosecutors to seek such a ban due to alleged legal misdeeds on the part of the political figure in question. It could be related to misappropriation of funds, misuse of political office, or any number of other legal issues.
Keep in mind that until the legal processes are fully complete, this is technically an allegation, and Le Pen would have the right to defend herself in court. Whether or not Le Pen is actually banned from running for French presidency will depend entirely on the outcome of any legal proceedings.