Here are 5 possible replacements for Michael Flynn

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Michael Flynn

REUTERS/Carlos Barria

Former US National Security Advisor Michael Flynn.

Former National Security Adviser Michael Flynn's abrupt resignation made waves on Monday evening, as pressure mounted amid controversy over his communications with a Russian ambassador.

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Nevertheless, as the principal adviser on national security issues, the opening in President Donald Trump's administration is a crucial one that the administration is most likely to fill quickly.

The position is appointed by the president, and does not require a lengthy confirmation hearing from the Senate.

Here are five possible candidates that may become the next national security adviser to Trump: