According to an October 22, 2013 article in Space News, NASA Administrator Charles Bolden told a panel of the National Research Council that a “capabilities-based approach” for developing a space exploration program was all the space agency could afford, given the money that has been appropriated.
What Bolden is saying is that while NASA is mandated to send astronauts to explore space beyond low Earth orbit, neither the president nor Congress has actually allocated funds to do so. All NASA has the funding to do is to develop the Orion spacecraft and the Space Launch System heavy lifter. Money will have to come eventually if NASA is to either snag an asteroid and explore it, as the Obama administration wants, or go back to the moon, as many in Congress want.
The National Research Council has previously criticized the Obama mandate to explore an asteroid. The NRC also recommended that measures be found to ensure that NASA receive the money it needs to carry out a deep space exploration program, including budget increases and cost sharing with international and business partners.