Popescu-Tariceanu is accused of making "declarations not in line with reality" concerning his links with several Romanian and Israeli businessmen who have already been charged, thus "hindering the course of justice".
The Brussels attacks have pushed security to the forefront of Britain's EU referendum campaign this week, as intelligence experts came out of the shadows to press the benefits and disadvantages of membership.
The European Union and Turkey agreed on a deal to stem the migrant crisis, including a three-billion-euro ($3.2-billion) aid package for Syrian refugees in Turkey.
Eurogroup chief Jeroen Dijsselbloem warned that a small group of EU countries may be forced to form a "mini-Schengen" if the bloc fails to resolve its migrant crisis.
Dutch Prime Minister Mark Rutte defended an EU cooperation deal with Ukraine as vital for European stability only months before a referendum Dutch eurosceptics have forced on the accord.
European Union president Donald Tusk called for calm after Turkey, a candidate for membership of the bloc, shot down a Russian war plane on the Syrian border.
Brussels will remain at the highest possible alert level on Monday with schools and metros closed over a "serious and imminent" security threat similar to the Paris attacks.
The European Union agreed to rush through reforms to the passport-free Schengen zone by the end of the year amid growing concerns about border security in the wake of the Paris attacks.
European Commission chief Jean-Claude Juncker insisted that Britain would not leave the EU, as leaders prepare to discuss David Cameron's reform demands at a summit next month.
European Commission President Jean-Claude Juncker firmly defended Sunday the EU's hotly-contested plan to redistribute refugees across Europe despite calls by Poland to scrap the scheme after the deadly attacks in Paris.