You can build that way if you want it...
I don't think anybody can do it from first level, though I'm not up on the entire oeuvre of Dragon Magazine powers, but at higher levels powers definitely become available to defenders that can let them do it. If you have compendium access you'll probably have the most luck looking at battlemind powers. Looking at PHB3 where they were introduced they get bits like Ghost in the Steel (at-will 7 augment 2: before your EONT the next time the creature makes a melee attack you choose the target), Intellect Sunder (daily 15: the creature can only use basic attacks and must include you as a target (save ends)), and Armor of Blades (at-will 23 reaction: a creature at range 1 hits you instead of an ally).
...but there's an unexamined assumption here.
Forcing a creature to attack you in 3.5e is much more useful than doing it in 4e, because in 3.5e your healing doesn't live on you. Healing comes from spells and magic items and uses the spell or magic item up, so if somebody swings at a hard target there's less chance damage will even happen in the first place and your total stock of heals remain unchanged. A wounded character with lots of hit points is also less likely to waste overhealing from good rolls.
But in 4e, your healing lives on you. Aside from a few leader powers, mostly cleric powers, anything that heals a character will expend character-specific resources called healing surges. If a character never gets hit in an adventuring day all their healing surges go to waste; if one character takes the vast brunt of attacks they'll run dry on healing surges while the rest of the party still has plenty. Some magic items exist which can spread the load, but as she was launched the system did not favor one character absorbing all the damage.
So yes, you can probably make a character that can force enemies to attack them, and they're likely to lean psionic. But because everybody has their own personal stock of daily healing, becoming this kind of focused target might actually end up being detrimental to your party's long-term survival.