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Researchers at the University of Illinois at Chicago and Northwestern University have engineered a tethered ribosome that works nearly as well as the authentic cellular component, or organelle, that produces all theUS President Donald Trump announced that the US is withdrawing its signature from an international treaty intended to regulate the multi-billion dollar arms trade.

Trump made the announcement to a cheering crowd at the National Rifle Association, which has lobbied against the treaty.

Trump said the treaty could harm American sovereignty and signed a letter telling Congress to halt the ratification of the treaty before tossing his pen into the crowd.

The UN said the treaty, which 101 countries have ratified, is the "only global instrument aimed at improving transparency and accountability in the international arms trade."

US President Donald Trump announced on Friday that the US is withdrawing from a United Nations treaty that regulates the multi-billion dollar arms trade.

Trump told a cheering National Rifle Association in Indianapolis on Friday that