Dean Obeidallah, a former attorney, is the host of SiriusXM radio's daily program "The Dean Obeidallah Show" and a columnist for The Daily Beast. Follow him @DeanObeidallah. The opinions expressed in this commentary are his own. View more opinion articles on CNN.

(CNN) Speaker Nancy Pelosi made headlines -- and outraged Donald Trump -- this week by declaring that, "We believe that the President of The United States is engaged in a cover-up." In this case, Pelosi was speaking of Trump's stonewalling of requests by House Democrats for information, such as his tax returns.

But there's potentially an even more appalling cover-up by Trump -- or by some in his administration -- that concerns the death of a 10-year-old migrant girl just five weeks before the November 2018 midterm elections that the Trump administration didn't reveal at the time to the American public. In fact, we only learned about the death of 10-year-old Darlyn Cristabel Cordova-Valle , a migrant from El Salvador, this past week thanks to an investigation by CBS News. As CBS reported, and the Trump administration has now confirmed, this young girl died on September 29, 2018, of "a fever and respiratory distress" after complications from surgery that left her in a coma. A Health and Human Services spokesperson said that she had a history of congenital heart defects and was in a "medically fragile" state when she came into US custody.

Her death poses a few vitally important questions: Has the Trump administration failed to inform us of other migrant children who have died in US custody? How do we prevent these deaths in the future? And why did Trump and his officials not reveal Darlyn's death to the American public for nearly eight months?

This last question is not just about politics but potentially about life and death as well. HHS has said that reporting requirements don't mandate they tell the media of such deaths, as reasoning for why it was not reported sooner. But there's no doubt that if we learned about Darlyn's death in September 2018, it would've made headlines as the first migrant child death in US custody in years. Would that media coverage have resulted in US Border Patrol, and others caring for these children, to change their procedures for the better, possibly saving the lives of the two young migrant children, 7-year-old Jakelin Caal and 8-year-old Felipe Gómez Alonzo, who died just two months later? We will never know that.