The INSIDER daily digest -- Jan. 8, 2018

By John Liang / January 8, 2019 at 1:56 PM

This Tuesday INSIDER Daily Digest features news on the tug-of-war between the Trump administration and congressional Democrats over funding for a southern border wall, plus the future of arms control agreements and more.

We start off with the tug-of-war between the Trump administration and congressional Democrats over funding for a southern border wall:

Trump could tap $20B in unobligated DOD funds to build wall

How much Pentagon money can President Trump potentially use to build an emergency wall on the southern border? The short answer is about $20 billion.

Democrats vow to fight Trump if he orders DOD to build border wall

Democrats have spent days pushing back against President Trump's claim that he can order the military to use emergency funds to build a wall along the southern border, the debate over which has driven the federal government into a partial 17-day shutdown.

The future of arms control agreements under the Trump administration isn't exactly clear:

Former diplomats, defense officials see challenges, opportunities in fraying nuclear security consensus

The potential for House Democrats to remove their support for a nuclear triad and uncertainty surrounding how the Trump administration will proceed on arms control agreements are among the top issues threatening a "fragile" consensus on nuclear security, according to former diplomats and defense officials.

The head of Army Training and Doctrine Command spoke at an industry event this week:

TRADOC chief: Leaders must take active approach to mission command

The Army needs to change the way its field-grade officers think about mission command before it is ready to compete with a near-peer threat, according to the leader of Training and Doctrine Command.

The Army and Marine Corps will be getting more Abrams tank Trophy active protection systems:

Army places additional $80M order for Trophy APSs

Leonardo DRS today announced they and Israeli partner Rafael have received a $79.6 million award to deliver additional Trophy active protection systems to the Army and Marine Corps for Abrams tanks.

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