South Sudan's rebel leader Riek Machar is to be relocated to a neutral country outside the region as part of a deal to end more than four years of civil war in the country.
US President Donald Trump has threatened to impose tariffs on an additional $200bn (£151bn) of Chinese goods in a growing trade row.
Mr Trump said the 10% tariffs would come into effect if China "refuses to change its practices".
The move would be a major escalation of the dispute. World stock markets have suffered sharp falls as a result.
The former US First Lady Laura Bush has condemned a controversial policy that splits up families who illegally enter the country.
Writing in the Washington Post, she describes the separation of children from their parents as cruel, immoral and heart-breaking.
Her comments follow growing controversy over President Donald Trump's "zero-tolerance" immigration policy.
Earlier Melania Trump made a rare statement expressing concern.
The government of the Central African Republic (CAR) says the acquittal and release of former DR Congo Vice-President Jean-Pierre Bemba is a failure of international justice.
Bemba was released from prison in Belgium yesterday after being acquitted of war crimes committed in CAR during 2002-3 by the International Criminal Court (ICC) last Friday.