It’s OK to have navigation on your landing page, but it depends on your targeted audience. If the campaign is for new people who never visited your website, it is good to have navigation. So this allows them to interact with your website. In other cases where you are re-marketing for people who already visited your website, then you can remove navigation to avoid any distractions. They can focus on your offer. In both cases, at the top, you should add your logo and link it to your home page of the website.