Sanders also pushed back Monday against the notion that the president has worsened online bullying.

"When it comes to kids, this is something that has been problematic, and something that we have seen over the last decade," Sanders said. "And the first lady sees it to be an important issue, and something that she wants to address."Written material distributed in support of the initiative includes a booklet adults can use to talk to children about being online. It is similar to one the Federal Trade Commission released during the Obama administration. A spokeswoman for the first lady said the agency asked Mrs. Trump to include the booklet in her materials. The agency also wrote a blog post thanking the first lady for distributing it.

Modern first ladies typically highlight personal causes.

Nancy Reagan encouraged kids to "Just Say No" to drugs, while Barbara Bush and Laura Bush emphasized literacy and education. Michelle Obama launched her "Let's Move" campaign against childhood obesity about a year after moving to the White House.

AP