When do I renew for Liberia, especially if I have a valid VISA in passport still?

My passport expires within 5 months of my travel to Liberia but I have a VISA in my passport that will be valid- 1) Do I need to renew? 2) If I renew-

Source: http://www.us-passport-service-guide.com/when-do-i-renew-for-liberia-especially-if-i-have-a-valid-visa-in-passport-still.html

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