https://www.reuters.com/article/us-el-salvador-bitcoin-imf/el-salvador-presidents-bitcoin-push-casts-shadow-over-imf-efforts-idUSKCN2DJ2GT >A push by El Salvador's President Nayib Bukele to make his country the first in the world to formally adopt bitcoin as legal tender has sparked concerns about the outlook for its programme with the International Monetary Fund (IMF).