Missouri-born rapper Nelly joined a rally in Ferguson telling crowds that "they needed a plan".
Nelly orating with a bullhorn. Tells crowd they need a plan. People ask what his plan is. He doesn't have a plan http://t.co/CywUyVkGmA
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The singer had been tweeting in support of migrants when she was bombarded with abusive messages.
Ministers are reportedly considering plans in a bid to lower inward migration.
In a tweet on Saturday, the US president didn't give a reason for his absence but said he wished"everyone well and have a great evening".