Nigeria, June 6 -- Chad's President, Mahamat Deby, has retaliated against Donald Trump's travel ban by suspending visa issuance to US citizens.

Mr Deby disclosed this on Thursday, a day after Mr Trump signed the proclamation banning Chad nationals and citizens from six other African countries from entering the US.

PREMIUM TIMES reported that the new US travel ban affected 12 countries while seven other countries were issued visa restrictions.

Aside Chad, other affected African countries are Republic of Congo, Equatorial Guinea, Eritrea, Libya, Somalia and Sudan.

According to Mr Trump, the ban was imposed to protect the US against foreign terrorists and other security threats.

"It is the policy of the United States to protect its citi...