A former staffer of Donald Trump’s White House laid into her old boss’s decision to film a TikTok video attacking her political opponent in a section of Arlington National Cemetery where campaign photos and videos are barred. Trump’s TikTok account posted a video showing him smiling and giving a thumbs-up in Section 60 of the cemetery as he attacked the Biden administration’s handling of the Afghanistan exit. The section is reserved for military members who died after serving in Iraq and Afghanistan. Alyssa Farah Griffin told panelists on CNN’s “NewsNight” on Wednesday night she did a number o…