CHICAGO (CBS) — An emotional Chicago mother stood by President Donald Trump Wednesday as he signed a new law cracking down on sex trafficking.

Yvonne Ambrose wiped away tears as the President signed the Fight Online Sex Trafficking Act, also known as FOSTA.

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Ambrose’s daughter Desiree Robinson was a victim of child sex trafficking and was murdered in 2016.

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Ambrose testified before the U.S. Senate last fall telling lawmakers her 16-year-old daughter was prostituted on the now shut-down classified website Backpage dot-com.

“ and other companies like this must be held responsible for what they have created,” she said in 2017.

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The FOSTA bill gives prosecutors more power to go after sex trafficking websites as well as enhancing penalties and fines.