Could Donald Trump actually be impeached?

Things are getting serious for Donald Trump. The swiftly unrolling Ukraine scandal could cause him to become only the third president to be impeached.But what is impeachment? How does it work? And how likely is it to happen? Adam Gabbatt has the answers

Donald Trump,US,gdnpfpnewsus,US news,Trump impeachment,Trump,Nancy Pelosi,US impeachment,Republicans,Democrats,US Senate,James Comey,Bill Clinton,Watergate,Nixon,Will Trump be impeached,Robert Mueller,Trump affair,